Just got my Umbrel home but login fails

This is a lulu!
Did the initial set up, created the main user and password which was successfully stored in my browsers keychain.
Everything looked fine until an auto update took place to the latest release.
There were no interruptions during the upgrade and since it completed I can no longer access it!
So looks like i’m up a creek without a paddle.
Thanks to anyone who can help.

Miles Pearson
Is there a way to cause it to revert to the previous version of the os? i.e. pre update.

No further assistance needed.