Hi all,

how do i downgrade my psp its the slim 2003 (it says psp 2003 on the bottom bar code at the end of the psp), and behind the battery it says date code 7D, i accidently upgraded it to version 6.20 how do i downgrade it, it was chipped before but i cant remember where i got it chipped from, please help any links to tutoirals or videos would be greatly appreciated.

Thanks in advance.. sorry if its already posted i wasnt sure what to search.

Oh and is it possible to chip the psp without a pandora battery please help.. thanks.