Dear friends, I bought a locked (AT&T) iPhone 4 with iOS 5.0.1 on it with BB 04.11.08. It was not activated and I did a tethered jailbreak using Redsn0w 0.9.9b8. Then I discovered that it is impossible (to date) to unlock 04.11.08 baseband and I just want to give this phone back. The problem is that "Restore" and "Check for Update" buttons are greyed out... How can I get this thing to do a factory restore so that it goes back to non activated mode? I read that I need to use TinyUmbrella and uncheck the box "Set Hosts to Cydia on exit". I did that but the button "Restore" in iTunes 10.5.2 is grayed out and I can't do anything Can anyone help me, please?