Can I change the Boot Slot from Fastboot with a command?

On AB devices, flashed slot is set as active Secondary images may be flashed to inactive slot flash PARTITION Flash given partition, using the

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

fastboot get active slot I tried the fastboot update on windows on my thor device and am getting this error: Setting current slot to 'a' OKAY Finished

fastboot_ error_ failed to identify current slot Execute magiskboot repack to repack the boot image, and you will get a file, flash this file to device by fastboot INFO Official