Lucky7 - Revision history

AidenIsik: Add minimal acceptable device tree

2026-04-14T17:23:31Z

Add minimal acceptable device tree

← Older revision		Revision as of 17:23, 14 April 2026
Line 123:		Line 123:
	python3 mkdtboimg.py create --custom1=32 <output> <input>		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.		</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>

AidenIsik: Add boot image and device tree information

2026-03-16T21:23:00Z

Add boot image and device tree information

← Older revision		Revision as of 21:23, 16 March 2026
Line 107:		Line 107:

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

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

2026-03-15T20:27:36Z

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

← Older revision		Revision as of 20:27, 15 March 2026
Line 3:		Line 3:
	\|Model=Samsung Galaxy Watch FE		\|Model=Samsung Galaxy Watch FE
	\|ReleaseDate=2024-06-13		\|ReleaseDate=2024-06-13
	\|Status=~~unsupported~~		\|Status=port in progress
	\|Stars=0		\|Stars=0
	\|Chipset=exynos5515		\|Chipset=exynos5515

AidenIsik: Add metadata

2026-03-15T20:06:17Z

Add metadata

← Older revision		Revision as of 20:06, 15 March 2026
Line 1:		Line 1:
			{{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==		==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.		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.

AidenIsik: Add section describing how to get UART output.

2026-03-15T18:39:04Z

Add section describing how to get UART output.

← Older revision		Revision as of 18:39, 15 March 2026
Line 58:		Line 58:

	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).		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.

AidenIsik: Update bootloader unlocking information

2026-02-26T10:52:18Z

Update bootloader unlocking information

← Older revision		Revision as of 10:52, 26 February 2026
Line 24:		Line 24:
	'''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).'''		'''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~~.'''		'''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 ~~with~~ the following steps:		The bootloader of the Galaxy Watch FE can be unlocked using the following steps, with the buttons facing to the right:

	* Open settings.		* Open settings.
Line 35:		Line 35:
	* Quickly press the upper button several times to open the bootloader menu.		* 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.		* 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.		* 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.		* After rebooting, if you end up in the recovery, follow the steps presented to wipe the device's data.
	* Your bootloader is now unlocked.		* Your bootloader is now unlocked.

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

2026-02-20T01:30:46Z

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

← Older revision		Revision as of 01:30, 20 February 2026
Line 1:		Line 1:
	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==
			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.

	~~==Description==~~		There are two different variants of this watch:
	~~This~~ watch ~~is sold in 2 variations~~:
	{\| class="wikitable"		{\| class="wikitable"
	\|+		\|+
Line 23:		Line 23:
	== Bootloader Unlocking ==		== 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).'''		'''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.'''		'''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:		The bootloader of the Galaxy Watch FE can be unlocked with the following steps:

	* Open settings.		* Open settings.
	* ~~Locate the~~ "~~build number~~"~~, which should be in the~~ "~~About Watch~~" ~~menu (this may differ between versions).~~		* Go to "About watch" -> "Software information"
	* Tap the ~~build number~~ several times until you are informed that developer mode has been enabled.		* 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.		* 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.		* 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.		* 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.		* 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.		* 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.		* After rebooting, if you end up in the recovery, follow the steps presented to wipe the device's data.
	* Your bootloader is now unlocked.		* 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).

AidenIsik: Add bootloader unlocking information.

2026-02-18T13:11:56Z

Add bootloader unlocking information.

New page

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.