Can't play umds anymore on custom firmware.?

Question

Hi I have a 3.10 OE-A PSP. I can only play one of my UMDS now and that is Twisted Metal: Head On. I think its because it dosent require a certain firmware. Well anyways why cant I play games like Daxter or GTA. Is there some kinda way to fix this?

When I try it says failed to run game.

Answer 1

Might want to ask here - http://www.psp-hacks.com/forums