I have an unlocked iphone 2g with firmware 3.0 working great. I run itunes 8 on it. Recently bought an ipod nano with video camera, but it says it requires itunes 9. If i upgrade to itunes 9 will my iphone still be able to sync with that itunes? Will i need to upgrade my firmware to sync to itunes 9, if so what firmware and how would i unlock it?