I don't know about Audya, if running the updates will put everything at it should be.
When update SD1, as far as I remember, it did rewrite about all at the HDisk.
Don't know what the manual say about full factory restore, but guess AJ will reply to your questions.
Also, if you have not already tried it, it might be a solution to run an update?
Version number should show in the display when boot up, so maybe try run the same to see what happens?
https://www.ketron.it/en/software/content/52-audya/Also, if there is a factory CD among the equipment, there might be a full restore in it?
Good luck with restore and enjoy your new 'baby'.