About discoverings...

Method I've use seems like to be known a bit time ago. The point is, there is a way to put in work a new fresh PSViTA. Looks like you can use your account in 3 PSViTAS at same time and you can redownload game with no problem even if were removed from store.

The strange behaviour here was: device get all the properties of the first device you attach with the account (that part wasn't told to me) so... will keep research.