no matter what ive tried so far, i cant get tony hawks project 8 or gta vice city stories to properly boot up. i have a 3.40 oe-a psp. in other forums people are saying they got their tony hawks iso to work with devhook 0.4 for 2.71.... i didnt think i would need devhook seeing as i have th custom firmware. at the momoent when i go to game>memory stick i can see the mini clip for gta and tony hawks. but when i start gta the screen goes black, and when i start tony hawks the screen goes to the tony hawks project 8 screen, freezes and then psp turns off. no-umd has already been enabled. ive got other iso's to work fine, just these 2 so far. anyone know what to do?