pfSense after update to 22.05 internet is not working - how to go back a version

For some reason after the update PPPoE does not connect.
The only way I currently have internet is the cellular backup line…

how can i go back to version 22.01?
restoreing the config file did not do the trick. is the only way to do a clean install?

Yes, untill we’re well into the realm of the new ZFS Boot Environments, you’ll have to do a clean install and config restore to perform a downgrade to an earlier version.

Before doing that though, have you looked at the logs to see what might be causing the issue?

Status > System Logs > PPP