i just got my psp yesterday. it was at 2.60 so i downgraded to 1.50. all my homebrew worked amazing. i got gta liberty city stories and really wanted to play. so i got 2.71 SE-A. gta works. none of my homebrew does. i have doom on now. it loads to the psp logo then crashes. this also happens wen i run emulators. can someone help?