Yeah... I've done it as well. While waiting for my actual Vita games, I downloaded the "first ever vita backup" and played it a bit. Then I learned that the trophies will forever prevent me from signing into PSN (if there ever is a spoof, even). But anyway, I connected to a FTP and deleted every trace of the game and its save data, but the trophy data is still there. What's the actual trophy data location, if anyone happens to know? My current PSN account is literally empty so I have nothing to lose, but still. Cheers!