The waiting to find your device message is fairly common.

The easiest trick on this is to hold and continue to hold the Home Key when you turn on your tablet right when you are told to do so.

Also, it would be wise to make sure the tablet is charging since turning it off and on constantly is quite the battery drain.

I would give you my outdated Windows version (which has never failed), but I just fired it up, and it's no longer happy like it used to be.

I guess it's looking for an updated version and then stalls which I've never seen before.

Maybe it has something to do with the repositories being down.

I'm not sure.