Hello there, I have currently hacked 2 PSP Slims last night, a white one and a black one. I used the Pandora's Battery hack to do so. They both have the 3.71 M33 custom firmware but while the white one works perfectly fine and plays both homebrews and ISO, the black one only plays Homebrews and give an error when you try to launch the ISO. It reads the ISO but it's unplayable. I did them both exactly the same way a the same time. I even tries redoing it about a billion times and it still doesn't play ISO games. I even updated it to the 3.90 M33 firmware and still nothing. Can anyone help me on this one? the PSP model is a PSP 2001. thank you for your time.