Moving Fastboot to Userspace

How to change the current active partition slot? fastboot change slot stack trace: Error: failed to set active slot: Error: {error:{code:1,cmd:fastboot --set-active=b},stderr: waiting for any device > fastboot set active slot I guess your bootloader is unlocked? Did you try to change the active slot? Get the current active boot slot: fastboot getvar current-slot

fastboot getvar currentslot 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