I've been searching all over the forums and I'm in a state of confusion after reading through several posts. Hopefully someone could clear this up easily for me. I have an old fat PSP, version 1.5 working fine. Is it required that I have a Pandora battery to update my to the latest 3.71 m33 firmware? My confusion comes from reading a guide how to update to the latest and not once it mentions the Pandora battery or the memory stick, but then I read many other forum posts(On this forum and on other ones) where people in a similar situation as mine are told to get a Pandora battery and set up a magic memory stick.