How to change the current active partition slot?

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

fastboot get active slot Execute magiskboot repack to repack the boot image, and you will get a file, flash this file to device by fastboot INFO Official

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