I'm still having trouble finding out what to do. I jailbroke my 3GS on Spirit about 5 months ago. I would like to upgrade to 4.0. I'm on 3.1.2 now. I just want someone to put it plainly - what is the process for upgrading to a jailbroken 4.0? Also, I have MyWi on my phone now, will it carry over once I upgrade? Do I back it up to my computer? How do I even go about doing that? Thanks!! And I really did look everywhere for the answer but couldn't find anyone that was in my exact position.