How to change Android system boot slot form A to B

How to change Android system boot slot form A to B fastboot change slot I never even knew that you could use fastboot with a locked bootloader! Learned something new fastboot change 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

fastboot getvar currentslot --slot SLOT Override the default behavior and prompt fastboot to flash the slot that is passed in as an argument --set-active