I used the Lumines exploit and installed custom firmware 3.71 M33-3 (haven't bothered with update 4) on a friends psp...He lends it to someone. That someone connected it to a PS3 which updated it to official firmware 3.80. I used my modded psp to make a Pandora's battery to re-mod his psp....It worked first time!!! I can't understand people paying £30-£40 for one off eBay.