How to automate slot selection after android AB-Update

Moving Fastboot to Userspace fastboot get active 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 get active 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 change slot stack trace: Error: failed to set active slot: Error: {error:{code:1,cmd:fastboot --set-active=b},stderr: waiting for any device >