I have apple iphone 3G.i had tried to reset it by going to settings>>>general>>>reset>>>erase all data and settings.now it is stuck with apple logo on the screen and white circled lines.i want to Use Dfu mode.i want to know if i click restore and update,will it after restoring ask for official sim.i don't have official sim.please tell me what to do.i want my iphone in working condition again.