The best way to put custom firmware on your psp is to use a "Pandoras Battery"
In order to make a "Pandoras Battery" you'd need a psp with custom firmware already on there. You couldnt make one any other way im afraid.
So find someone with a hacked psp and ask them if they would convert a bettery for you
EDIT: If your based in the UK, i could make one for you, all you'd need to do is send me a spare battery and a memory card, has to be bigger then 32mb
PM me if your intrested
Adam
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