I have a promblem, me and my brother both have a psp he bought his second hand with 3.40 OE on it. My PSP was recently downgraded and then upgrade to 3.40 OE. I have Ratchet and Clank in a CSO format, it play ono my brothers but does not play on mine. On mine when I start the game the memory access light blinks and then goes black. it does not freeze up because I could just press Home to go back. My No-UMD is disabled and I have a UMD in the drive. Any suggestions???