How to automate slot selection after android AB-Update

fastboot get active slot
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Display a bootloader variable fastboot set_active suffix: Sets the active slot If slots are not supported, this does nothing fastboot boot

It means fastboot is waiting for a phone to be connected If the phone is physically connected but fastboot cannot find it, then either the

fastboot set active slot 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

fastboot_ error_ failed to identify current slot slots ourselves using a Fastboot command The Real Reason Why Music Is Getting Worse