I have withdrawn from OneUI 8 beta. Correct way to do it. Withdraw then install smart switch in laptop and connect your phone, take backup and it will show option to downgrade. Do that. Otherwise, your phone will not receive further updates.
I had faced the same issue my phone went on continuous boot loop in the end of September after Oneui 6.1.1 update. I went to the service centre, they gave me bill estimate of 42000. They were saying that its motherboard is gone. I have given that pho...