I need some advice - Just bought a preowned psp phat

Hi guys,

So I just bought a preowned psp fat model, and want custom firmware on it. I have got a pandora battery on it's way, and have a spare pro duo memory stick with magic gate.

The main issues are that:

The firmware is 5.03

The motherboard is IC003

Am I able to downgrade? Or is it not possible now with that firmware and motherboard combination?

If it is, could someone please point me to a noob friendly guide to setting it all up (downgrading and CW installation?)

Because I'm not good at this sort of stuff at all. haha -_-

If it's a fat, then it very well should be crackable regardless of OFW.