How to change Android system boot slot form A to B

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Install Twrp 3 Reboot Recovery slot No Internal 256GB 12GB RAM, 512GB 16GB RAM, 1TB 16GB RAM

Hello,I've successfully installed twrp and rooted via experimenting with TWRP, I tried booting from the 'B' slot Failure, stuck in fastboot Install Twrp 3 Reboot Recovery slot No Internal 256GB 12GB RAM, 512GB 16GB RAM, 1TB 16GB RAM

ohio poker tournaments Hello,I've successfully installed twrp and rooted via experimenting with TWRP, I tried booting from the 'B' slot Failure, stuck in fastboot I'm working with Android 9 Pie and I have one slot rooted and the other is not My reasoning to have my phone this way is