A brand new factory psp will most likely have ta-082.
http://www.maxconsole.net/content_img/ta82spot.jpg
Then use this downgrader instead. It's a lot more safer, and by dax himself.
http://downgrader.lan.st/ta082down.rar
If you don't have a ta-082 mobo, just skip the idstoragechange part. I've used the ta-082 dg about 3 times, all worked like a charm, but I've seen many bricks with this non-ta-082 dg.
