psp slim upgrading

hi. i tried to upgrade my friend's slim psp to custom 3.60 m33, after i placed the magic mem stick to the slip and normal batt to the slim psp, it showed a black screen then i pressed x, when i turned the psp slim on it was still 3.60.. on my phat psp i tried to set my battery back to normal, but my psp wouldnt start anymore. did i brick my psp? help please. need help fast. please please. thanks.




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oops sorry..hehe wont do it again.. anyway.. i sort of or did kill/damage my battery.. after changing it back from a pandora battery back to normal.. is there no way to fix this.. please do include this on the tutorial..like pandora can damage the psp's batt..

where do i find/get this new pandora app?

my new problem now is my battery wont charge.. its always zero percent even when i leave it charging over night.. i bought a new battery and my psp's working fine now.. but id still like to fix the old one..

also, when you change the fw of the slim from 3.60 to 3.60 m33, does it say 350.pbp error? is that how its supposed to work? i downloaded the file from the download section also from another site which i dont know if im allowed to post.. but it still gave me the same message when starting to make the m33 firmware -- error 350.pbp -- then would exit..