I have an iPhone 3GS - how do I erase the data on the phone without losing the jailbreak / unlock? I am looking to sell it. Please do not suggest restore and the re-jailbreak / re-unlock. I've paid too much to do that already so I just want to erase the content. If I go to settings - general - reset - erase all content and settings ... will this lose the jailbreak? Thanks for your help!!