Also, what is this pandora's battery I keep reading about? Pandora's Battery is a special battery that boots the PSP into service mode which, when paired with a Magic Memory Stick, allows the user to downgrade their PSP, regardless of their current firmware. Any regular battery can be made into a Pandora's Battery, as long as someone you know has a PSP with either fw 1.50 or a custom firmware. I modded someone's fat PSP a while back, not sure what firmware they are on now. How can I find instructions on how to mod a new Slim using a modded fat?