Hey guys I got a sim card that I have cut down to fit into the iPhone 4, and so I've backed up my iPhone, now I need to restore it to get rid of the jailbreak. In the guide here on the forum, it says you restore through itunes. Well when I click that, it tells me it will restore to factory settings and install the new updated OS. I'm afraid this sim card I have cut might not work, so I don't want to risk updating to 4.2 right now. Can I restore my phone to factory settings by just doing it in the phone itself? Like if I go to general settings, and "erase all content and settings", will this remove the jailbreak the same way? Thanks!