Hello all: I am not a tech savy . . . so please help me out in the simplest language. I have a 3G 16GB JB and UL with fw 2.28.00 version 2.2 (5G77). How can I upgrade to 3.0 or 3.1 and keep the phone JB and UL still? The reason I try to upgrade is because when I go to the App store, I can not download most of the apps because it says 'this application requires the iPhone 2.2.1 software update'. If I can update to this 2.2.1 software, I am just be happy as long as I can continue to keep my iPhone JB/UL. Many thanks.