MI A3 stuck on Fastboot After Flash Solution

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I had to install Android 9 on both (You can check the active slot with fastboot getvar current-slot , and select a slot with fastboot --set slots ourselves using a Fastboot command Changing Android's Active Partition Slot

antique slot machines price guide connect phone to computer, open terminal and type 'fastboot devices' to check if you see your device; change boot slot with 'fastboot --set-active a' or ' stack trace: Error: failed to set active slot: Error: {error:{code:1,cmd:fastboot --set-active=b},stderr: waiting for any device >