I bought my PS3 from a private seller. I got my old account on my new ps3 but I have realized something very obvious. I have been using the other guys account the whole time. Anyway I can change my account info etc.?
If your gt5 data is not on your account not a lot you can do. There may be an update that unlock copyright game saves, then again there may not be an update that unlocks game saves!
Best thing to do is bite the bullet and start again, with your account.