some 1 said you dont need a battery mod for custom firmware you only need it for unbrickien the psp?

well, this depends on what firmware you're on right now. I'm pretty sure that with firmware 1.5 and under, you can put any firmware on your psp without a pandora's battery. but above 1.5, you do need one.

Please speak English here. You will need a pandora battery to apply custom firmware to your psp, As far as I know that is the only safe method of this.