How to automate slot selection after android AB-Update

How to automate slot selection after android AB-Update fastboot get active slot I was able to fix this with fastboot --set-active=a followed immediately by fastboot flash boot and all the other partitions fastboot_ error_ failed to identify current slot 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_ error_ failed to identify current slot 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 set active slot If the bootloader implements fastboot, it should support the command set_active slot> that sets the current active slot to the given slot (this Get active system slot fastboot getvar current-slot fastboot getvar all Get active system slot