Help with a fatboy psp 1001

[WMD54]

or, if you can use a phat battery with a slim, why not soft mod your friend's battery using your slim, then when you've used it to fix his psp, change it back to a normal battery?

[CaNANDian]

or, if you can use a phat battery with a slim, why not soft mod your friend's battery using your slim, then when you've used it to fix his psp, change it back to a normal battery?

I don't think he has CFW