FAILED (remote: 'Fastboot command is not allowed

查詢目前使用那個槽， 看目前的slot是a還是b，一般都是a。1$ sudo fastboot getvar current-slot 參考 adb

Display a bootloader variable fastboot set_active suffix: Sets the active slot If slots are not supported, this does nothing fastboot boot

fastboot getvar currentslot I guess your bootloader is unlocked? Did you try to change the active slot? Get the current active boot slot: fastboot getvar current-slot

fastboot set active slot Reset attack mitigation for firmware-based boot modes such as fastboot being active GrapheneOS enables support for ending secondary user profile