Alright, I've been looking for answers on this question for a long time. I guess this forum has some experts who might be help me wih my prob. I have a psp with 3.40 OE-A Firmware. I run all my games with the no-umd thingie disabled, and with a umd disc inserted, the way it should be done with these custom firmwares. The problem is that some games just won't work. The thumbnail works like a charm but when i try to start it , the screen just stays black forever. Again this is only with some dlled games. For instance : FIFA08, Burnout Legends, DBZ Shin budokai, Daxter etc. work , while PES2007, DBZ Shin Budokai 2 and Burnout Dominator don't. Anyone has has this problems too ? I don't really see a pattern in it. It's not that iso or cso don't work, i got both of them to run on my psp, it's just some games. Is it maybe a common problem with the 3.40OE-A firmware and you guys suggest that i should upgrade to 3.50 ? Lookin forward to some replies. Thanks in advance !!!