seluna (Pixel Watch 3 LTE) and solios (Pixel Watch 3 Wi-Fi/Bluetooth) are Android 16 smartwatches featuring the Qualcomm Snapdragon W5 Gen 1 chipset (monaco).

Description

This watch is sold in 4 variations. LTE and Wi-Fi versions in both 41 mm and 45 mm:

Codename	Model Name	Note
seluna	Pixel Watch 3 LTE	selene+luna=seluna=common LTE platform
selene	Pixel Watch 3 LTE (41 mm)	Resolution: 408x408
luna	Pixel Watch 3 LTE (45 mm)	Resolution: 456x456
solios	Pixel Watch 3 Wi-Fi	sol+helios=solios=common Wi-Fi platform
helios	Pixel Watch 3 Wi-Fi (41 mm)	Resolution: 408x408
sol	Pixel Watch 3 Wi-Fi (41 mm)	Resolution: 456x456

Bootloader Unlock

The bootloader of the Pixel Watch 3 can be unlocked by enabling “OEM unlock” within the Android developer options, rebooting into bootloader mode via ADB and unlocking afterward via fastboot.

# reboot to bootloader
adb reboot bootloader

# check if the watch is unlockable. If yes it returns "1"
fastboot flashing get_unlock_ability

# ask the device to prompt for bootloader unlock
fastboot flashing unlock

After issuing the unlock command, the action must be confirmed on the watch.

Fastboot

You can reach Fastboot Mode without pairing the device by tapping the upper left and lower right of the display right after booting (the first Google Logo). See also here.

Repair

The Pixel Watch 3 has replaceable straps, but the device is glued shut, making repair attempts harder.

Firmware

OTA firmware images are available on developers.google.com. The zip files contain a file called payload.bin that can be extracted with payload-dumper-go.

Once extracted, the partitions are contained in named image files. e.g. boot.img.