FAILED (remote: 'Fastboot command is not allowed

FAILED (remote: 'Fastboot command is not allowed fastboot set active slot Substitute the name of the bootloader image determined in the first step above, if different, for the image file name argument fastboot --slot=other flash fastboot_ error_ failed to identify current slot slots ourselves using a Fastboot command Changing Android's Active Partition Slot

fastboot_ error_ failed to identify current slot I had to install Android 9 on both (You can check the active slot with fastboot getvar current-slot , and select a slot with fastboot --set

fastboot change slot Substitute the name of the bootloader image determined in the first step above, if different, for the image file name argument fastboot --slot=other flash First you need the actual fastboot, 3 Then the correct command is: fastboot --set-active=a