Ive looked around, but have yet to find a clear answer. Any help would be appreciated. I have an iPhone 4, thethered unlocked with the Gevey Sim, baseband 04.10.01,*and want to update to iOS 5. I have a tethered unlock. My question is, is it possible to update the baseband without jailbreaking first? If so how? I used to not have to jailbreak, is this still possible? I DO have an AT&T sim to get passed the activation screen. Any help? Thank you.