Changing Android's Active Partition Slot

Changing Android's Active Partition Slot 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 set active 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 set active slot Reset attack mitigation for firmware-based boot modes such as fastboot being active GrapheneOS enables support for ending secondary user profile

fastboot get active slot But I want without fastboot command My usecase is the bootloader need to check the currect active slot and set the proper suffix How can I do 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