I have an iphone 3g that i just upgraded with itunes it was jailbroken before now its not and is stuck on emergency mode. I did this to make it look like ithasnt been jailbroken to exchange at apple because of dust in the screen and some frozen pixels. So im planning on using an uncles sim to change it at apple then give it back to him, and when i get my new one it will be in emeergency mode too right? so to jailbreak this i just put it into dfu mode when itunes detects it i upload my custom firmware right? just need to confirm this so my heart rate can go back to normal ive been really worried ive just ****ed up. So i just put a new iphone thats in emergency mode into dfu mode to jailbreak right?