I can't roll back using smart switch on a PC? I've downloaded the app and connect my phone. However it just gives me the back up or restore options neither of which can downgrade my phone back to one ui 7?
If you go to this link and scroll down to the FAQ and type rollback. It should help you with rolling back. You need to make sure you're withdrawn from the program first I believe.
Thank you for reporting this! I will forward this to the relevant team. You can also submit an error report through the Samsung Members app to assist the developers in resolving the issue.