OK, so say you go the straight route and send your tablet to JPay to be unlocked. If all goes well, and you get back an unlocked tablet (and not a thumb drive & a sorry note from JPay). What do you have? An old tablet with old software. What can you do with it and how far can you update it?
I know my old 486 still runs, but it's a museum piece and has hit the end of it's upgrades long ago.
So is it even worth the effort as anything more than an intellectual exercise?