3GS firmware downgrade to send for repair
I will send my iphone 3GS in for repair (cracks in the plastic) and want to downgrade to the iphone os 3.0, but I am not sure right now if when I do downgrade I can restore the 3.1.2 backup (app data, address book etc.) using itunes 9.0.3 -is it possible?
here is the state of my iphone:
iphone OS: 3.1.2 (custom Pwnage tool ISPW)
I have a whole catalogue of old vanilla and custom ISPW's, whats the best way to proceed to restore the vanilla 3.0?