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well, after attempting to make my own pandora battery and failing, i searched the internet and came across this nifty little tool. it's called the "battery service tool" and it's made by Datel. basically, it's about the size of a battery charger. you stick your battery in it, push a button, and it allows you to put your psp in service mode. put the battery back in, push the button again, and it goes back to normal. using a "magic memory stick," i successfully got my psp to CFW 3.90M33-3. i had tried to research this thing before buying, but couldn't find much. i hope this video helps some of you by showing you exactly how it works.