How to change the current active partition slot?

fastboot get active slot
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查詢目前使用那個槽， 看目前的slot是a還是b，一般都是a。1$ sudo fastboot getvar current-slot 參考 adb

Android phones can now have an A and a B partition system for the OS and we can use this fastboot command to check and see which slot is currently active

fastboot getvar currentslot Android phones can now have an A and a B partition system for the OS and we can use this fastboot command to check and see which slot is currently active

fastboot_ error_ failed to identify current slot 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