I just got my i5 last night. It was on 6.0.2 which I immediately jailbroke. Then this morning, I see that evasi0n released the update to jailbreak 6.1.2. So what I did was I downloaded the new evasi0n, downloaded the 6.1.2 ipw from iphonewiki (firmware section), hit option+restore in iTunes on my Mac, chose the ipw, and let it do its thing. Well, now it gives an error in iTunes that says it couldn't restore, and my new phone is stuck in that screen with the USB pointing at iTunes, and when I enter into DFU mode, nothing happens in iTunes!!!