How to change Android system boot slot form A to B

How to change Android system boot slot form A to B fastboot get active slot It may not flash TWRP as there is no active slot not bootable) If it is a slotted device in Fastboot run the command: fastboot getvar fastboot get active slot On AB devices, flashed slot is set as active Secondary images may be flashed to inactive slot flash PARTITION Flash given partition, using the

fastboot get active slot I was able to fix this with fastboot --set-active=a followed immediately by fastboot flash boot and all the other partitions

fastboot getvar currentslot 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  So i decided to flash twrp into a boot slot via fastboot then, i set the active-slot to that but then I still don't get twrp idk why Now, I can get into