Hi! I have an old 1st generation iphone, model #MA712LL. It is running ver. 2.2 (5G77) and is unlocked and jailbroken. I use it on Centennial Wireless. NOT on att !! I would like to upgrade it to the 3.01 system. I am deathly afraid of messing it up and rendering it useless, it is my lifeline. I have a windows xp pc and itunes 8.2 but that's about all. I don't know what to do next. I realize it will prolly wipe my apps and stuff out, that's cool, I can deal with that. It's clogged up with junk anyway and needs a good cleaning out. Can someone please tell me what steps I need to do? What do I need to download? All I see is stuff for the new 3G phones.. Thank you!