Basically I have a psp1000, haven't used it in around a year, and I'm guessing I need to update my custom firmware now so I can play some newer games; but after researching there seem to be so many out there. Apprently Im running 3.51 M33 atm, and I've been happy with it - So could someone please tell me what firmware I should use and how I replace the 3.51 M33 with it - cheers