Hi, basically my iPhone 4 is water damaged and it won't power up in ANY way whatsoever unless i put it in the wall charger, it won't even boot up if i put it through normal usb to the iMac. So i want to give it to apple tomorrow for them to put in a new battery, however as it is jailbroken i don't think they will fix it. So i went to reset and erased all content, but when it starts up it still has that coloured line on top of the apple logo so they will know it is jailbroken. And after that it just goes to a black screen. So has anyone got any advise on how to get rid of that coloured line as that's how they will know it is jailbroken. I can't do anything on the phone either because it goes to a black screen. So the only way left is for me is to do something so that everytime it boots up it goes into DFU mode or make it crash in a way that it needs a restore and doesn't go to that coloured line boot up screen.