Shut it off then turn it on while the Welcome/Owner screen is being displayed:
Press 0 then 1 Destructive, clears working memory and resets all Global settings to factory defaults. Does not affect V-Scanners.
If they have actually been deleted from the scanner, there is no reset option on the PRO-197 that will restore them.
Yes, upgrade the CPU and DSP. Nothing enabled means all the objects are locked out (it does happen, I've seen software do this) or it has nothing in it to scan. It may well be all of the factory programming has been removed. You can download the original factory Virtual Scanners and send them to the scanner. I would just program something. Plug in at least 1 conventional object. It should be able to 'scan' it and that error should be gone. If you verify the scanner works proceed with programming it.