Hi are you sure it is Sony pmp because allot of china pmp's have faked Sony brands.
Do you have any pictures of the player, have u opened it up to see what chip is inside, if not i suggest you do, if it is sunplus I'm afraid there is not much you can do.
You can try the DEAD PLAYER GUIDE
http://www.mympxplayer.org/dead-play...ide-vt567.html