Phat 80gb 4.31 downgrade?

Hi Everyone,

Sorry if this has been asked before, i've tried to find a definitive answer myself, yet there is alot of conflicting information online.

I have a old phat 80GB that is currently on official FW4.31, i'm looking into getting it downgraded or a Custom FW placed on it, Is this at all possible with this model and fw?

If so, whats the best way of going about it?

Thanks