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15. Run step 3 to install the firmware that is required to make your U.P.M.S or if you wish you can run the full installer and miss step 4 (this may take awhile but be patient as long as the memory stick light is flashing it is still working)
Wait; so if you're trying to make this UPMS on an already custom firmware'd PSP it HAS to reinstall the custom firmware?
I'm already on 3.80 M33 and I already have a Pandora battery, but I want to install this UPMS on my spare memory stick.