AsteroidOS - User contributions [en]

Lucky7

2026-04-14T17:23:31Z

AidenIsik: Add minimal acceptable device tree

{{Watches
|Name=lucky7
|Model=Samsung Galaxy Watch FE
|ReleaseDate=2024-06-13
|Status=port in progress
|Stars=0
|Chipset=exynos5515
|KernelVersion=7.0-rc3
|AndroidVersion=tiramisu
|StatusDisplay=bad
|StatusTouch=bad
|StatusBluetooth=bad
|StatusHaptics=bad
|StatusTiltToWake=bad
|StatusLightSensor=bad
|StatusAlwaysOnDisplay=bad
|StatusDualDisplay=bad
|StatusMicrophone=bad
|StatusSpeaker=bad
|StatusCompass=bad
|StatusSteps=bad
|StatusHeartRate=bad
|StatusUSB=bad
|StatusWLAN=bad
|StatusGPS=bad
|StatusNFC=bad
|StatusCellular=bad
|StatusCamera=missing
|StatusCrown=missing
|StatusHands=missing
}}
[[Category:Watches]]
==Description==
Lucky7 (Samsung Galaxy Watch FE) is a feature-rich, round smartwatch measuring 40mm developed by Samsung. It released with Android 13, and uses the Exynos W920 (S5E5515) Cortex-A55 based AArch64 SoC. Its hardware is very similar to that of the Samsung Galaxy Watch 4 (codenamed Fresh). See the [https://www.gsmarena.com/samsung_galaxy_watch_fe-13112.php GSMArena] page for more hardware details.

There are two different variants of this watch:
{| class="wikitable"
|+
!Codename
!Model Number
!Model Name
!Display Size
|-
|lucky7bs
|SM-R861
|Samsung Galaxy Watch FE (WiFi)
|40mm
|-
|lucky7us
|SM-R866
|Samsung Galaxy Watch FE (LTE)
|40mm
|}

== Bootloader Unlocking ==
'''WARNING: Unlocking the bootloader will trip Knox efuses! Connections inside the SoC will be irreversibly severed, you will permanently lose the ability to use features such as Samsung Pay, and you will get a warning on each startup stating that the device's software "may be corrupt" (this can be ignored).'''

'''NOTE: While Samsung disabled bootloader unlocking on their phones with the OneUI 8 (Android 16) update, they did not do so for their watches (as of 26/02/2026). All firmware versions of this watch can be unlocked.'''

The bootloader of the Galaxy Watch FE can be unlocked using the following steps, with the buttons facing to the right:

* Open settings.
* Go to "About watch" -> "Software information"
* Tap the software version several times until you are informed that developer mode has been enabled.
* Locate the "OEM unlocking" option in the developer options menu, and switch it on.
* Hold both buttons on the side of the watch until the Samsung logo appears with the "rebooting..." text below it.
* Quickly press the upper button several times to open the bootloader menu.
* Use the upper button on the side of the watch to navigate to the "Bootloader unlock" option and select it. A short click moves to the next option and a long hold selects an option.
* Press the upper button to unlock the bootloader.
* After rebooting, if you end up in the recovery, follow the steps presented to wipe the device's data.
* Your bootloader is now unlocked.

== Repair ==
This watch is relatively easy to disassemble to repair. There are four Y00 screws on the back, then everything else just pulls apart.

It uses a rubber gasket for water resistance, so as long as it isn't damaged during disassembly it should be able to be reused, and water resistance not compromised.

See the Samsung Galaxy Watch 4 [https://www.ifixit.com/Device/Samsung_Galaxy_Watch_4 iFixit repair guides] for detailed steps for various repairs.

== USB ==
There are no USB connections exposed anywhere on the exterior of this watch. There are however internal USB pads near the top edge of the watch, which can have a USB cable soldered onto them.

The pinout, with the top edge facing towards you, is as follows from left to right:

* Vcc
* ID
* D+
* D-
* GND

To connect to the watch over USB, you must connect the ID pin to GND through approximately 150kOhms of resistance (it doesn't have to be exact).

==UART==
The internal USB pads can also be used for receiving 3V UART signals.

The pinout, with the top edge facing towards you, is as follows from left to right:

*Not connected
*ID
*TX
*RX
*GND

To connect to the watch over UART, you must connect the ID pin to GND through 619kOhms of resistance. You should also either add a connector which can be unplugged between the watch and your UART adapter, or a switch on the ID line. This is required as in order for the watch to transmit serial data the ID pin must be disconnected then reconnected during the boot process.

The bootloader does not transmit any data over UART.

To get the kernel to transmit its logs over UART, add 'console=ttySAC0,115200n8 loglevel=7' to CONFIG_CMDLINE in the defconfig and recompile.

==Booting==

===Boot Image Format===
The boot image format used by the S-Boot bootloader on the Galaxy Watch FE is [https://source.android.com/docs/core/architecture/bootloader/boot-image-header#header-v4 Android boot version 4], with INIT_BOOT and DTBO. The partitions involved in booting Linux are therefore BOOT, INIT_BOOT, VENDOR_BOOT, and DTBO, along with VBMETA for signature enforcement.

===Device Tree Format===
The device tree, used to specify to Linux which hardware the system has and where, in the absence of ACPI, is split into two. The main blob (mostly SoC-specific) part of the device tree is part of the VENDOR_BOOT partition, whereas the overlay blob (mostly board-specific) lives in its own partition, DTBO. The overlay is combined with the main blob by the bootloader to create one unified device tree for Linux to use.

Both of these conform to the standard [https://devicetree-specification.readthedocs.io/en/stable/flattened-format.html device tree blob format] produced by DTC and the Linux build system, with an extra Android-specific header created by [https://android.googlesource.com/platform/system/libufdt/ libufdt] prepended to the beginning of the file.

The main device tree blob in VENDOR_BOOT is a standard Android device tree blob as specified as above, except that the 'CUSTOM1' field is set to 0xFF (255). It can be generated using mkdtboimg.py from libufdt with the following command:<syntaxhighlight lang="sh">
python3 mkdtboimg.py create --custom1=255 <output> <input>
</syntaxhighlight>The overlay device tree blob in DTBO is also a standard Android device tree blob, except that the 'CUSTOM1' field is set to 0x20 (32). It can be generated using mkdtboimg.py with the following command:<syntaxhighlight lang="sh">
python3 mkdtboimg.py create --custom1=32 <output> <input>
</syntaxhighlight>The meaning of the values in the 'CUSTOM1' fields is not currently known. They are possibly just magic numbers to identify the different blobs.

===Minimum Acceptable Device Tree===
The bootloader of this watch requires certain device tree nodes to be present, due to it applying its own overlay blob on top of the two supplied by the VENDOR_BOOT and DTBO partitions. If the nodes the bootloader wants to overlay onto are not present, it will refuse to boot. The most minimal device tree source which fulfills this requirement is as follows (note that it is useless for anything other than satisfying the bootloader):<syntaxhighlight lang="dts" line="1">
/dts-v1/;

/ {
#address-cells = <0x02>;
#size-cells = <0x01>;

dpm: dpm {
};

itmon: itmon {
};

memlogger_policy: samsung,memlogger {
};

reserved_memory: reserved-memory {
#address-cells = <0x02>;
#size-cells = <0x01>;
ranges;

dss_rmem: debug_snapshot {
#address-cells = <0x02>;
#size-cells = <0x01>;

log_platform: log_platform {
};

log_arrdumpreset: log_arrdumpreset {
};

log_arrdumppanic: log_arrdumppanic {
};

log_first: log_first {
};

log_kevents: log_kevents {
};

log_kevents_small: log_kevents_small {
};

log_s2d: log_s2d {
};
};
};
};
</syntaxhighlight>

Lucky7

2026-03-16T21:23:00Z

AidenIsik: Add boot image and device tree information

Lucky7

2026-03-15T20:27:36Z

AidenIsik: Change status to be in line with other in-progress watches

Fresh/wise

2026-03-15T20:27:13Z

AidenIsik: Change status to be in line with other in-progress watches

{{Watches
|Name=fresh
|OtherNames=wise
|Model=Samsung Galaxy Watch 4 (Standard & Classic)
|ReleaseDate=2021-08-27
|Status=port in progress
|Stars=0
|Chipset=exynos5515
|KernelVersion=7.0-rc3
|AndroidVersion=redvelvetcake
|StatusDisplay=bad
|StatusTouch=bad
|StatusBluetooth=bad
|StatusHaptics=bad
|StatusTiltToWake=bad
|StatusLightSensor=bad
|StatusAlwaysOnDisplay=bad
|StatusDualDisplay=bad
|StatusMicrophone=bad
|StatusSpeaker=bad
|StatusCompass=bad
|StatusSteps=bad
|StatusHeartRate=bad
|StatusUSB=bad
|StatusWLAN=bad
|StatusGPS=bad
|StatusNFC=bad
|StatusCellular=bad
|StatusCamera=missing
|StatusCrown=missing
|StatusHands=missing
}}
[[Category:Watches]]
==Description==
Fresh (Samsung Galaxy Watch 4) and Wise (Samsung Galaxy Watch 4 Classic) are feature-rich, round smartwatches developed by Samsung. They released with Android 11, and use the Exynos W920 (S5E5515) Cortex-A55 based AArch64 SoC. Their hardware is very similar to that of the Samsung Galaxy Watch FE (codenamed [[Lucky7]]).

The Galaxy Watch 4 Classic also has a rotating bezel which can be used for navigation.

See the [https://www.gsmarena.com/samsung_galaxy_watch4-11045.php GSMArena] page for more hardware details.

There are eight different variants of this watch:
{| class="wikitable"
|+
!Codename
!Model Number
!Model Name
!Display Size
|-
|freshbs
|SM-R860
|Samsung Galaxy Watch 4 (WiFi)
|40mm
|-
|freshus
|SM-R865
|Samsung Galaxy Watch 4 (LTE)
|40mm
|-
|freshbl
|SM-R870
|Samsung Galaxy Watch 4 (WiFi)
|44mm
|-
|freshul
|SM-R875
|Samsung Galaxy Watch 4 (LTE)
|44mm
|-
|wisebs
|SM-R880
|Samsung Galaxy Watch 4 Classic (WiFi)
|42mm
|-
|wiseus
|SM-R885
|Samsung Galaxy Watch 4 Classic (LTE)
|42mm
|-
|wisebl
|SM-R890
|Samsung Galaxy Watch 4 Classic (WiFi)
|46mm
|-
|wiseul
|SM-R895
|Samsung Galaxy Watch 4 Classic (LTE)
|46mm
|}

==Bootloader Unlocking==
'''WARNING: Unlocking the bootloader will trip Knox efuses! Connections inside the SoC will be irreversibly severed, you will permanently lose the ability to use features such as Samsung Pay, and you will get a warning on each startup stating that the device's software "may be corrupt" (this can be ignored).'''

'''NOTE: While Samsung disabled bootloader unlocking on their phones with the OneUI 8 (Android 16) update, they did not do so for their watches (as of 26/02/2026). All firmware versions of this watch can be unlocked.'''

The bootloader of the Galaxy Watch 4 can be unlocked using the following steps, with the buttons facing to the right:

*Open settings.
*Go to "About watch" -> "Software information"
*Tap the software version several times until you are informed that developer mode has been enabled.
*Locate the "OEM unlocking" option in the developer options menu, and switch it on.
*Hold both buttons on the side of the watch until the Samsung logo appears with the "rebooting..." text below it.
*Quickly press the upper button several times to open the bootloader menu.
*Use the upper button on the side of the watch to navigate to the "Bootloader unlock" option and select it. A short click moves to the next option and a long hold selects an option.
*Press the upper button to unlock the bootloader.
*After rebooting, if you end up in the recovery, follow the steps presented to wipe the device's data.
*Your bootloader is now unlocked.

==Repair==
This watch is relatively easy to disassemble to repair. There are four Y00 screws on the back, then everything else just pulls apart.

It uses a rubber gasket for water resistance, so as long as it isn't damaged during disassembly it should be able to be reused, and water resistance not compromised.

See the [https://www.ifixit.com/Device/Samsung_Galaxy_Watch_4 iFixit repair guides] for detailed steps for various repairs.

==USB==
There are no USB connections exposed anywhere on the exterior of this watch. There are however internal USB pads near the top edge of the watch, which can have a USB cable soldered onto them.

The pinout, with the top edge facing towards you, is as follows from left to right:

*Vcc
*ID
*D+
*D-
*GND

To connect to the watch over USB, you must connect the ID pin to GND through approximately 150kOhms of resistance (it doesn't have to be exact).

==UART==
The internal USB pads can also be used for receiving 3V UART signals.

The pinout, with the top edge facing towards you, is as follows from left to right:

*Not connected
*ID
*TX
*RX
*GND

To connect to the watch over UART, you must connect the ID pin to GND through 619kOhms of resistance. You should also either add a connector which can be unplugged between the watch and your UART adapter, or a switch on the ID line. This is required as in order for the watch to transmit serial data the ID pin must be disconnected then reconnected during the boot process.

The bootloader does not transmit any data over UART.

To get the kernel to transmit its logs over UART, add 'console=ttySAC0,115200n8 loglevel=7' to CONFIG_CMDLINE in the defconfig and recompile.

Technical Details of AsteroidOS Watches

2026-03-15T20:12:24Z

AidenIsik: Clarify that not all watches use libhybris

While AsteroidOS does not use Android, certain devices do rely on Android drivers that are, in the context of AsteroidOS, supported with [https://github.com/libhybris/libhybris libhybris]. See the [[Frequently Asked Questions (FAQ)]] for more details on this.

In the table below "Chipset" refers to the device that contains not only the main CPU(s) but also other important parts of the system.

=== Supported watches ===
{{#cargo_query:
tables=Watches
|fields=CONCAT("[[",_pageName,"|",Model,"]]")=Model,Name,Stars,ReleaseDate,Chipset,KernelVersion=Kernel Version,AndroidVersion=Original Android
|order by=Watches.Stars DESC
|format=table
|limit=9999
|where=Watches.Status = "supported"
|more results text=
}}

=== Experimental watches ===
{{#cargo_query:
tables=Watches
|fields=CONCAT("[[",_pageName,"|",Model,"]]")=Model,Name,Stars,ReleaseDate,Chipset,KernelVersion=Kernel Version,AndroidVersion=Original Android
|order by=Watches.Stars DESC
|format=table
|limit=9999
|where=Watches.Status = "experimental"
|more results text=
}}

=== All watches ===
{{#cargo_query:
tables=Watches
|fields=CONCAT("[[",_pageName,"|",Model,"]]")=Model,Name,Status,Stars,ReleaseDate,Chipset,KernelVersion=Kernel Version,AndroidVersion=Original Android
|order by=Watches.Stars DESC
|format=table
|limit=9999
|more results text=
}}

=== Kernel versions (all watches) ===
{{#cargo_query:
tables=Watches
|fields=CONCAT("",KernelVersion)=Kernel Version,count(*)
|group by=Kernel Version
|order by=count(*) DESC
|limit=15
|format=pie chart
}}

=== Original Android versions (all watches) ===
Although AsteroidOS is not Android and does not use Android, knowing which version of Android was originally shipped with the watch is helpful for porting drivers.

{{#cargo_query:
tables=Watches
|fields=AndroidVersion,count(*)
|group by=AndroidVersion
|order by=count(*) DESC
|limit=15
|format=pie chart
}}

=== Chipset varieties (all watches) ===
{{#cargo_query:
tables=Watches
|fields=Chipset,count(*)
|group by=Chipset
|order by=count(*) DESC
|limit=15
|format=pie chart
}}

Lucky7

2026-03-15T20:06:17Z

AidenIsik: Add metadata

{{Watches
|Name=lucky7
|Model=Samsung Galaxy Watch FE
|ReleaseDate=2024-06-13
|Status=unsupported
|Stars=0
|Chipset=exynos5515
|KernelVersion=7.0-rc3
|AndroidVersion=tiramisu
|StatusDisplay=bad
|StatusTouch=bad
|StatusBluetooth=bad
|StatusHaptics=bad
|StatusTiltToWake=bad
|StatusLightSensor=bad
|StatusAlwaysOnDisplay=bad
|StatusDualDisplay=bad
|StatusMicrophone=bad
|StatusSpeaker=bad
|StatusCompass=bad
|StatusSteps=bad
|StatusHeartRate=bad
|StatusUSB=bad
|StatusWLAN=bad
|StatusGPS=bad
|StatusNFC=bad
|StatusCellular=bad
|StatusCamera=missing
|StatusCrown=missing
|StatusHands=missing
}}
[[Category:Watches]]
==Description==
Lucky7 (Samsung Galaxy Watch FE) is a feature-rich, round smartwatch measuring 40mm developed by Samsung. It released with Android 13, and uses the Exynos W920 (S5E5515) Cortex-A55 based AArch64 SoC. Its hardware is very similar to that of the Samsung Galaxy Watch 4 (codenamed Fresh). See the [https://www.gsmarena.com/samsung_galaxy_watch_fe-13112.php GSMArena] page for more hardware details.

There are two different variants of this watch:
{| class="wikitable"
|+
!Codename
!Model Number
!Model Name
!Display Size
|-
|lucky7bs
|SM-R861
|Samsung Galaxy Watch FE (WiFi)
|40mm
|-
|lucky7us
|SM-R866
|Samsung Galaxy Watch FE (LTE)
|40mm
|}

== Bootloader Unlocking ==
'''WARNING: Unlocking the bootloader will trip Knox efuses! Connections inside the SoC will be irreversibly severed, you will permanently lose the ability to use features such as Samsung Pay, and you will get a warning on each startup stating that the device's software "may be corrupt" (this can be ignored).'''

'''NOTE: While Samsung disabled bootloader unlocking on their phones with the OneUI 8 (Android 16) update, they did not do so for their watches (as of 26/02/2026). All firmware versions of this watch can be unlocked.'''

The bootloader of the Galaxy Watch FE can be unlocked using the following steps, with the buttons facing to the right:

* Open settings.
* Go to "About watch" -> "Software information"
* Tap the software version several times until you are informed that developer mode has been enabled.
* Locate the "OEM unlocking" option in the developer options menu, and switch it on.
* Hold both buttons on the side of the watch until the Samsung logo appears with the "rebooting..." text below it.
* Quickly press the upper button several times to open the bootloader menu.
* Use the upper button on the side of the watch to navigate to the "Bootloader unlock" option and select it. A short click moves to the next option and a long hold selects an option.
* Press the upper button to unlock the bootloader.
* After rebooting, if you end up in the recovery, follow the steps presented to wipe the device's data.
* Your bootloader is now unlocked.

== Repair ==
This watch is relatively easy to disassemble to repair. There are four Y00 screws on the back, then everything else just pulls apart.

It uses a rubber gasket for water resistance, so as long as it isn't damaged during disassembly it should be able to be reused, and water resistance not compromised.

See the Samsung Galaxy Watch 4 [https://www.ifixit.com/Device/Samsung_Galaxy_Watch_4 iFixit repair guides] for detailed steps for various repairs.

== USB ==
There are no USB connections exposed anywhere on the exterior of this watch. There are however internal USB pads near the top edge of the watch, which can have a USB cable soldered onto them.

The pinout, with the top edge facing towards you, is as follows from left to right:

* Vcc
* ID
* D+
* D-
* GND

To connect to the watch over USB, you must connect the ID pin to GND through approximately 150kOhms of resistance (it doesn't have to be exact).

==UART==
The internal USB pads can also be used for receiving 3V UART signals.

The pinout, with the top edge facing towards you, is as follows from left to right:

*Not connected
*ID
*TX
*RX
*GND

To connect to the watch over UART, you must connect the ID pin to GND through 619kOhms of resistance. You should also either add a connector which can be unplugged between the watch and your UART adapter, or a switch on the ID line. This is required as in order for the watch to transmit serial data the ID pin must be disconnected then reconnected during the boot process.

The bootloader does not transmit any data over UART.

To get the kernel to transmit its logs over UART, add 'console=ttySAC0,115200n8 loglevel=7' to CONFIG_CMDLINE in the defconfig and recompile.

Fresh/wise

2026-03-15T20:03:40Z

AidenIsik: Add metadata

{{Watches
|Name=fresh
|OtherNames=wise
|Model=Samsung Galaxy Watch 4 (Standard & Classic)
|ReleaseDate=2021-08-27
|Status=unsupported
|Stars=0
|Chipset=exynos5515
|KernelVersion=7.0-rc3
|AndroidVersion=redvelvetcake
|StatusDisplay=bad
|StatusTouch=bad
|StatusBluetooth=bad
|StatusHaptics=bad
|StatusTiltToWake=bad
|StatusLightSensor=bad
|StatusAlwaysOnDisplay=bad
|StatusDualDisplay=bad
|StatusMicrophone=bad
|StatusSpeaker=bad
|StatusCompass=bad
|StatusSteps=bad
|StatusHeartRate=bad
|StatusUSB=bad
|StatusWLAN=bad
|StatusGPS=bad
|StatusNFC=bad
|StatusCellular=bad
|StatusCamera=missing
|StatusCrown=missing
|StatusHands=missing
}}
[[Category:Watches]]
==Description==
Fresh (Samsung Galaxy Watch 4) and Wise (Samsung Galaxy Watch 4 Classic) are feature-rich, round smartwatches developed by Samsung. They released with Android 11, and use the Exynos W920 (S5E5515) Cortex-A55 based AArch64 SoC. Their hardware is very similar to that of the Samsung Galaxy Watch FE (codenamed [[Lucky7]]).

The Galaxy Watch 4 Classic also has a rotating bezel which can be used for navigation.

See the [https://www.gsmarena.com/samsung_galaxy_watch4-11045.php GSMArena] page for more hardware details.

There are eight different variants of this watch:
{| class="wikitable"
|+
!Codename
!Model Number
!Model Name
!Display Size
|-
|freshbs
|SM-R860
|Samsung Galaxy Watch 4 (WiFi)
|40mm
|-
|freshus
|SM-R865
|Samsung Galaxy Watch 4 (LTE)
|40mm
|-
|freshbl
|SM-R870
|Samsung Galaxy Watch 4 (WiFi)
|44mm
|-
|freshul
|SM-R875
|Samsung Galaxy Watch 4 (LTE)
|44mm
|-
|wisebs
|SM-R880
|Samsung Galaxy Watch 4 Classic (WiFi)
|42mm
|-
|wiseus
|SM-R885
|Samsung Galaxy Watch 4 Classic (LTE)
|42mm
|-
|wisebl
|SM-R890
|Samsung Galaxy Watch 4 Classic (WiFi)
|46mm
|-
|wiseul
|SM-R895
|Samsung Galaxy Watch 4 Classic (LTE)
|46mm
|}

==Bootloader Unlocking==
'''WARNING: Unlocking the bootloader will trip Knox efuses! Connections inside the SoC will be irreversibly severed, you will permanently lose the ability to use features such as Samsung Pay, and you will get a warning on each startup stating that the device's software "may be corrupt" (this can be ignored).'''

'''NOTE: While Samsung disabled bootloader unlocking on their phones with the OneUI 8 (Android 16) update, they did not do so for their watches (as of 26/02/2026). All firmware versions of this watch can be unlocked.'''

The bootloader of the Galaxy Watch 4 can be unlocked using the following steps, with the buttons facing to the right:

*Open settings.
*Go to "About watch" -> "Software information"
*Tap the software version several times until you are informed that developer mode has been enabled.
*Locate the "OEM unlocking" option in the developer options menu, and switch it on.
*Hold both buttons on the side of the watch until the Samsung logo appears with the "rebooting..." text below it.
*Quickly press the upper button several times to open the bootloader menu.
*Use the upper button on the side of the watch to navigate to the "Bootloader unlock" option and select it. A short click moves to the next option and a long hold selects an option.
*Press the upper button to unlock the bootloader.
*After rebooting, if you end up in the recovery, follow the steps presented to wipe the device's data.
*Your bootloader is now unlocked.

==Repair==
This watch is relatively easy to disassemble to repair. There are four Y00 screws on the back, then everything else just pulls apart.

It uses a rubber gasket for water resistance, so as long as it isn't damaged during disassembly it should be able to be reused, and water resistance not compromised.

See the [https://www.ifixit.com/Device/Samsung_Galaxy_Watch_4 iFixit repair guides] for detailed steps for various repairs.

==USB==
There are no USB connections exposed anywhere on the exterior of this watch. There are however internal USB pads near the top edge of the watch, which can have a USB cable soldered onto them.

The pinout, with the top edge facing towards you, is as follows from left to right:

*Vcc
*ID
*D+
*D-
*GND

To connect to the watch over USB, you must connect the ID pin to GND through approximately 150kOhms of resistance (it doesn't have to be exact).

==UART==
The internal USB pads can also be used for receiving 3V UART signals.

The pinout, with the top edge facing towards you, is as follows from left to right:

*Not connected
*ID
*TX
*RX
*GND

To connect to the watch over UART, you must connect the ID pin to GND through 619kOhms of resistance. You should also either add a connector which can be unplugged between the watch and your UART adapter, or a switch on the ID line. This is required as in order for the watch to transmit serial data the ID pin must be disconnected then reconnected during the boot process.

The bootloader does not transmit any data over UART.

To get the kernel to transmit its logs over UART, add 'console=ttySAC0,115200n8 loglevel=7' to CONFIG_CMDLINE in the defconfig and recompile.

Fresh/wise

2026-03-15T18:39:30Z

AidenIsik: Add information on UART output.

==Description==
Fresh (Samsung Galaxy Watch 4) and Wise (Samsung Galaxy Watch 4 Classic) are feature-rich, round smartwatches developed by Samsung. They released with Android 11, and use the Exynos W920 (S5E5515) Cortex-A55 based AArch64 SoC. Their hardware is very similar to that of the Samsung Galaxy Watch FE (codenamed [[Lucky7]]).

The Galaxy Watch 4 Classic also has a rotating bezel which can be used for navigation.

See the [https://www.gsmarena.com/samsung_galaxy_watch4-11045.php GSMArena] page for more hardware details.

There are eight different variants of this watch:
{| class="wikitable"
|+
!Codename
!Model Number
!Model Name
!Display Size
|-
|freshbs
|SM-R860
|Samsung Galaxy Watch 4 (WiFi)
|40mm
|-
|freshus
|SM-R865
|Samsung Galaxy Watch 4 (LTE)
|40mm
|-
|freshbl
|SM-R870
|Samsung Galaxy Watch 4 (WiFi)
|44mm
|-
|freshul
|SM-R875
|Samsung Galaxy Watch 4 (LTE)
|44mm
|-
|wisebs
|SM-R880
|Samsung Galaxy Watch 4 Classic (WiFi)
|42mm
|-
|wiseus
|SM-R885
|Samsung Galaxy Watch 4 Classic (LTE)
|42mm
|-
|wisebl
|SM-R890
|Samsung Galaxy Watch 4 Classic (WiFi)
|46mm
|-
|wiseul
|SM-R895
|Samsung Galaxy Watch 4 Classic (LTE)
|46mm
|}

==Bootloader Unlocking==
'''WARNING: Unlocking the bootloader will trip Knox efuses! Connections inside the SoC will be irreversibly severed, you will permanently lose the ability to use features such as Samsung Pay, and you will get a warning on each startup stating that the device's software "may be corrupt" (this can be ignored).'''

'''NOTE: While Samsung disabled bootloader unlocking on their phones with the OneUI 8 (Android 16) update, they did not do so for their watches (as of 26/02/2026). All firmware versions of this watch can be unlocked.'''

The bootloader of the Galaxy Watch 4 can be unlocked using the following steps, with the buttons facing to the right:

*Open settings.
*Go to "About watch" -> "Software information"
*Tap the software version several times until you are informed that developer mode has been enabled.
*Locate the "OEM unlocking" option in the developer options menu, and switch it on.
*Hold both buttons on the side of the watch until the Samsung logo appears with the "rebooting..." text below it.
*Quickly press the upper button several times to open the bootloader menu.
*Use the upper button on the side of the watch to navigate to the "Bootloader unlock" option and select it. A short click moves to the next option and a long hold selects an option.
*Press the upper button to unlock the bootloader.
*After rebooting, if you end up in the recovery, follow the steps presented to wipe the device's data.
*Your bootloader is now unlocked.

==Repair==
This watch is relatively easy to disassemble to repair. There are four Y00 screws on the back, then everything else just pulls apart.

It uses a rubber gasket for water resistance, so as long as it isn't damaged during disassembly it should be able to be reused, and water resistance not compromised.

See the [https://www.ifixit.com/Device/Samsung_Galaxy_Watch_4 iFixit repair guides] for detailed steps for various repairs.

==USB==
There are no USB connections exposed anywhere on the exterior of this watch. There are however internal USB pads near the top edge of the watch, which can have a USB cable soldered onto them.

The pinout, with the top edge facing towards you, is as follows from left to right:

*Vcc
*ID
*D+
*D-
*GND

To connect to the watch over USB, you must connect the ID pin to GND through approximately 150kOhms of resistance (it doesn't have to be exact).

==UART==
The internal USB pads can also be used for receiving 3V UART signals.

The pinout, with the top edge facing towards you, is as follows from left to right:

*Not connected
*ID
*TX
*RX
*GND

To connect to the watch over UART, you must connect the ID pin to GND through 619kOhms of resistance. You should also either add a connector which can be unplugged between the watch and your UART adapter, or a switch on the ID line. This is required as in order for the watch to transmit serial data the ID pin must be disconnected then reconnected during the boot process.

The bootloader does not transmit any data over UART.

To get the kernel to transmit its logs over UART, add 'console=ttySAC0,115200n8 loglevel=7' to CONFIG_CMDLINE in the defconfig and recompile.

Lucky7

2026-03-15T18:39:04Z

AidenIsik: Add section describing how to get UART output.

==Description==
Lucky7 (Samsung Galaxy Watch FE) is a feature-rich, round smartwatch measuring 40mm developed by Samsung. It released with Android 13, and uses the Exynos W920 (S5E5515) Cortex-A55 based AArch64 SoC. Its hardware is very similar to that of the Samsung Galaxy Watch 4 (codenamed Fresh). See the [https://www.gsmarena.com/samsung_galaxy_watch_fe-13112.php GSMArena] page for more hardware details.

There are two different variants of this watch:
{| class="wikitable"
|+
!Codename
!Model Number
!Model Name
!Display Size
|-
|lucky7bs
|SM-R861
|Samsung Galaxy Watch FE (WiFi)
|40mm
|-
|lucky7us
|SM-R866
|Samsung Galaxy Watch FE (LTE)
|40mm
|}

== Bootloader Unlocking ==
'''WARNING: Unlocking the bootloader will trip Knox efuses! Connections inside the SoC will be irreversibly severed, you will permanently lose the ability to use features such as Samsung Pay, and you will get a warning on each startup stating that the device's software "may be corrupt" (this can be ignored).'''

'''NOTE: While Samsung disabled bootloader unlocking on their phones with the OneUI 8 (Android 16) update, they did not do so for their watches (as of 26/02/2026). All firmware versions of this watch can be unlocked.'''

The bootloader of the Galaxy Watch FE can be unlocked using the following steps, with the buttons facing to the right:

* Open settings.
* Go to "About watch" -> "Software information"
* Tap the software version several times until you are informed that developer mode has been enabled.
* Locate the "OEM unlocking" option in the developer options menu, and switch it on.
* Hold both buttons on the side of the watch until the Samsung logo appears with the "rebooting..." text below it.
* Quickly press the upper button several times to open the bootloader menu.
* Use the upper button on the side of the watch to navigate to the "Bootloader unlock" option and select it. A short click moves to the next option and a long hold selects an option.
* Press the upper button to unlock the bootloader.
* After rebooting, if you end up in the recovery, follow the steps presented to wipe the device's data.
* Your bootloader is now unlocked.

== Repair ==
This watch is relatively easy to disassemble to repair. There are four Y00 screws on the back, then everything else just pulls apart.

It uses a rubber gasket for water resistance, so as long as it isn't damaged during disassembly it should be able to be reused, and water resistance not compromised.

See the Samsung Galaxy Watch 4 [https://www.ifixit.com/Device/Samsung_Galaxy_Watch_4 iFixit repair guides] for detailed steps for various repairs.

== USB ==
There are no USB connections exposed anywhere on the exterior of this watch. There are however internal USB pads near the top edge of the watch, which can have a USB cable soldered onto them.

The pinout, with the top edge facing towards you, is as follows from left to right:

* Vcc
* ID
* D+
* D-
* GND

To connect to the watch over USB, you must connect the ID pin to GND through approximately 150kOhms of resistance (it doesn't have to be exact).

==UART==
The internal USB pads can also be used for receiving 3V UART signals.

The pinout, with the top edge facing towards you, is as follows from left to right:

*Not connected
*ID
*TX
*RX
*GND

To connect to the watch over UART, you must connect the ID pin to GND through 619kOhms of resistance. You should also either add a connector which can be unplugged between the watch and your UART adapter, or a switch on the ID line. This is required as in order for the watch to transmit serial data the ID pin must be disconnected then reconnected during the boot process.

The bootloader does not transmit any data over UART.

To get the kernel to transmit its logs over UART, add 'console=ttySAC0,115200n8 loglevel=7' to CONFIG_CMDLINE in the defconfig and recompile.

Fresh/wise

2026-02-26T11:24:13Z

AidenIsik: Create Galaxy Watch 4 page based on Galaxy Watch FE page

==Description==
Fresh (Samsung Galaxy Watch 4) and Wise (Samsung Galaxy Watch 4 Classic) are feature-rich, round smartwatches developed by Samsung. They released with Android 11, and use the Exynos W920 (S5E5515) Cortex-A55 based AArch64 SoC. Their hardware is very similar to that of the Samsung Galaxy Watch FE (codenamed [[Lucky7]]).

The Galaxy Watch 4 Classic also has a rotating bezel which can be used for navigation.

See the [https://www.gsmarena.com/samsung_galaxy_watch4-11045.php GSMArena] page for more hardware details.

There are eight different variants of this watch:
{| class="wikitable"
|+
!Codename
!Model Number
!Model Name
!Display Size
|-
|freshbs
|SM-R860
|Samsung Galaxy Watch 4 (WiFi)
|40mm
|-
|freshus
|SM-R865
|Samsung Galaxy Watch 4 (LTE)
|40mm
|-
|freshbl
|SM-R870
|Samsung Galaxy Watch 4 (WiFi)
|44mm
|-
|freshul
|SM-R875
|Samsung Galaxy Watch 4 (LTE)
|44mm
|-
|wisebs
|SM-R880
|Samsung Galaxy Watch 4 Classic (WiFi)
|42mm
|-
|wiseus
|SM-R885
|Samsung Galaxy Watch 4 Classic (LTE)
|42mm
|-
|wisebl
|SM-R890
|Samsung Galaxy Watch 4 Classic (WiFi)
|46mm
|-
|wiseul
|SM-R895
|Samsung Galaxy Watch 4 Classic (LTE)
|46mm
|}

==Bootloader Unlocking==
'''WARNING: Unlocking the bootloader will trip Knox efuses! Connections inside the SoC will be irreversibly severed, you will permanently lose the ability to use features such as Samsung Pay, and you will get a warning on each startup stating that the device's software "may be corrupt" (this can be ignored).'''

'''NOTE: While Samsung disabled bootloader unlocking on their phones with the OneUI 8 (Android 16) update, they did not do so for their watches (as of 26/02/2026). All firmware versions of this watch can be unlocked.'''

The bootloader of the Galaxy Watch FE can be unlocked using the following steps, with the buttons facing to the right:

*Open settings.
*Go to "About watch" -> "Software information"
*Tap the software version several times until you are informed that developer mode has been enabled.
*Locate the "OEM unlocking" option in the developer options menu, and switch it on.
*Hold both buttons on the side of the watch until the Samsung logo appears with the "rebooting..." text below it.
*Quickly press the upper button several times to open the bootloader menu.
*Use the upper button on the side of the watch to navigate to the "Bootloader unlock" option and select it. A short click moves to the next option and a long hold selects an option.
*Press the upper button to unlock the bootloader.
*After rebooting, if you end up in the recovery, follow the steps presented to wipe the device's data.
*Your bootloader is now unlocked.

==Repair==
This watch is relatively easy to disassemble to repair. There are four Y00 screws on the back, then everything else just pulls apart.

It uses a rubber gasket for water resistance, so as long as it isn't damaged during disassembly it should be able to be reused, and water resistance not compromised.

See the [https://www.ifixit.com/Device/Samsung_Galaxy_Watch_4 iFixit repair guides] for detailed steps for various repairs.

==USB==
There are no USB connections exposed anywhere on the exterior of this watch. There are however internal USB pads near the top edge of the watch, which can have a USB cable soldered onto them.

The pinout, with the top edge facing towards you, is as follows from left to right:

*Vcc
*ID
*D+
*D-
*GND

To connect to the watch over USB, you must connect the ID pin to GND through approximately 150kOhms of resistance (it doesn't have to be exact).

Lucky7

2026-02-26T10:52:18Z

AidenIsik: Update bootloader unlocking information

Lucky7

2026-02-20T01:30:46Z

AidenIsik: Improved description, corrected bootloader unlocking steps, added USB and repair sections.

==Description==
Lucky7 (Samsung Galaxy Watch FE) is a feature-rich, round smartwatch measuring 40mm developed by Samsung. It released with Android 13, and uses the Exynos W920 (S5E5515) Cortex-A55 based AArch64 SoC. Its hardware is very similar to that of the Samsung Galaxy Watch 4 (codenamed Fresh). See the [https://www.gsmarena.com/samsung_galaxy_watch_fe-13112.php GSMArena] page for more hardware details.

There are two different variants of this watch:
{| class="wikitable"
|+
!Codename
!Model Number
!Model Name
!Display Size
|-
|lucky7bs
|SM-R861
|Samsung Galaxy Watch FE (WiFi)
|40mm
|-
|lucky7us
|SM-R866
|Samsung Galaxy Watch FE (LTE)
|40mm
|}

== Bootloader Unlocking ==
'''WARNING: Unlocking the bootloader will trip Knox efuses! Connections inside the SoC will be irreversibly severed, you will permanently lose the ability to use features such as Samsung Pay, and you will get a warning on each startup stating that the device's software "may be corrupt" (this can be ignored).'''

'''NOTE: If the device is running OneUI 8 (Android 16) or later, you might not be able to unlock the bootloader. Samsung completely removed bootloader unlocking from its phones globally, and are likely to have done so for their watches too (although this has not yet been verified). If you are on OneUI 7 (Android 15) or below, DO NOT UPDATE.'''

The bootloader of the Galaxy Watch FE can be unlocked with the following steps:

* Open settings.
* Go to "About watch" -> "Software information"
* Tap the software version several times until you are informed that developer mode has been enabled.
* Locate the "OEM unlocking" option in the developer options menu, and switch it on.
* Hold both buttons on the side of the watch until the Samsung logo appears with the "rebooting..." text below it.
* Quickly press the upper button several times to open the bootloader menu.
* Use the upper button on the side of the watch to navigate to the "Bootloader unlock" option and select it. A short click moves to the next option and a long hold selects an option.
* Follow any instructions presented to unlock the bootloader.
* After rebooting, if you end up in the recovery, follow the steps presented to wipe the device's data.
* Your bootloader is now unlocked.

== Repair ==
This watch is relatively easy to disassemble to repair. There are four Y00 screws on the back, then everything else just pulls apart.

It uses a rubber gasket for water resistance, so as long as it isn't damaged during disassembly it should be able to be reused, and water resistance not compromised.

See the Samsung Galaxy Watch 4 [https://www.ifixit.com/Device/Samsung_Galaxy_Watch_4 iFixit repair guides] for detailed steps for various repairs.

== USB ==
There are no USB connections exposed anywhere on the exterior of this watch. There are however internal USB pads near the top edge of the watch, which can have a USB cable soldered onto them.

The pinout, with the top edge facing towards you, is as follows from left to right:

* Vcc
* ID
* D+
* D-
* GND

To connect to the watch over USB, you must connect the ID pin to GND through approximately 150kOhms of resistance (it doesn't have to be exact).

Lucky7

2026-02-18T13:11:56Z

AidenIsik: Add bootloader unlocking information.

Lucky7 (Samsung Galaxy Watch FE) is a round smartwatch developed by Samsung, released with Android 13 and using the Exynos W920 (S5E5515) Cortex-A55 based AArch64 SoC.

==Description==
This watch is sold in 2 variations:
{| class="wikitable"
|+
!Codename
!Model Number
!Model Name
!Display Size
|-
|lucky7bs
|SM-R861
|Samsung Galaxy Watch FE (WiFi)
|40mm
|-
|lucky7us
|SM-R866
|Samsung Galaxy Watch FE (LTE)
|40mm
|}

== Bootloader Unlocking ==
'''WARNING: Unlocking the bootloader will trip Knox efuses! Connections inside the SoC will be irreversibly severed, you will permanently lose the ability to use features such as Samsung Pay, and you will get a warning on each startup stating that the device's software "may be corrupt" (this can be ignored).'''

'''NOTE: If the device is running OneUI 8 (Android 16) or later, you might not be able to unlock the bootloader. Samsung completely removed bootloader unlocking from its phones globally, and are likely to have done so for their watches too (although this has not yet been verified). If you are on OneUI 7 (Android 15) or below, DO NOT UPDATE.'''

The bootloader of the Galaxy Watch FE can be unlocked with the following steps:

* Open settings.
* Locate the "build number", which should be in the "About Watch" menu (this may differ between versions).
* Tap the build number several times until you are informed that developer mode has been enabled.
* Locate the "OEM unlocking" option in the developer options menu, and switch it on.
* Hold both buttons on the side of the watch until the Samsung logo appears with the "rebooting..." text below it.
* Quickly press the upper button several times to open the bootloader menu.
* Use the upper button on the side of the watch to navigate to the bootloader unlocking option and select it. A short click moves to the next option and a long hold selects an option.
* Follow any instructions presented to unlock the bootloader.
* After rebooting, if you end up in the recovery, follow the steps presented to wipe the device's data.
* Your bootloader is now unlocked.