Recently bought a PSP 2003 from here and it had custom M333 version 5.0, something like that....but don't want to run homebrew or emulators...so how do I get it back to the official Sony firmware? I deleted the custom firmware file from the PSP and all the emulator stuff According to system info the latest version is 5.00 which I believe is the custom firmware, under the PSP dashboard there is a icon with a red X through it which says 3.60...I can't delete that but if I click on it, it says version 5.00 is the latest version but I don't want this. Anyone care to help please? Is there a 'reset everything' button? I just want to go back to what you would basically have if you bought a new PSP.