I am trying to restore my iphone 3G from an iphone 3GS backup. I know...why? I had my iphone 3GS stolen and so am having to downgrade to my brothers old 3G. Is this possible? I tried doing the normal steps on itunes and came to a message saying that i had to set up the phone as a new iphone then upgrade the version on the new iphone (my 3G iphone) and then transfer, however the 3G is already at its current 4.2.1 version.