This is a custom ROM for the Huami AmazFit Smartwatch 2 (A1609) and the (to be announced) international Xiaomi AmazFit STRATOS (A1619).

• https://nicolasagliano.com/lo-sblocco-del-bootloader-e-arrivato/
• https://nicolasagliano.com/stratos-1-0-rom-italiana-per-lamazfit-stratos/
• https://forum.xda-developers.com/smartwatch/amazfit/rom-stratosfied-amazfit-amazfit-2-t3758506

adb shell reboot bootloader
fastboot devices
fastboot getvar all

fastboot oem unlock xxxxx
fastboot reboot

push firmware

adb push update.zip /sdcard/
adb push recovery.img /sdcard/
adb push start_update.sh /sdcard/
adb push md5s.txt /sdcard/

adb root
adb shell
cd /sdcard/; sh start_update.sh