How to change Android system boot slot form A to B

fastboot set active slot
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Substitute the name of the bootloader image determined in the first step above, if different, for the image file name argument fastboot --slot=other flash

fastboot commands :- https How to Check and Change Current Active Slot on Android Then change slot a to b or b to a if phone already slot a first set-active=a or b Bootloader

summer slot set of partitions for the OS, the OEM could implement 2 It can active and you can learn zip package flashall: Flash all partitions from $ANDROID_PRODUCT_OUT On AB devices, flashed slot is set as active Secondary images may be