How to change Android system boot slot form A to B

How to change Android system boot slot form A to B fastboot change slot On AB devices, flashed slot is set as active Secondary images may be flashed to inactive slot flash PARTITION Flash given partition, using the fastboot set active slot Sustainable Impact Creating lasting, positive change for the planet, our people, and the communities where we live, work, and do business

fastboot change slot I was able to fix this with fastboot --set-active=a followed immediately by fastboot flash boot and all the other partitions