FAILED (remote: 'Fastboot command is not allowed

It means fastboot is waiting for a phone to be connected If the phone is physically connected but fastboot cannot find it, then either the

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

fastboot change slot If the bootloader implements fastboot, it should support the command set_active slot> that sets the current active slot to the given slot (this

fastboot_ error_ failed to identify current slot If you device randomly got stuck in fastboot after a reboot, that means the counter hit zero and the bootloader marked your slot as unbootable