I have withdrawn from OneUI 8 beta.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.
Open the Samsung Members app on your phone, navigate to the beta program section, and tap the Settings icon (⋮ or gear) to find the "Withdraw" option. After confirming your withdrawal in the app, connect your phone to a computer and use the Samsung Smart Switch PC version to "Downgrade" to the previous stable release. The rollback process will reset your device and erase all data. Make sure to back up all important data before proceeding with the withdrawal and rollback.
Kindly go to service center for rollback to previous version through Odin. If you like please accept as a solution it's help to others users also, click on 3dots in my reply section and click on accept solution. Thanks.
