I have been pulling my hair out trying to restore my iPhone. I have the latest version of Tiny Umbrella, and the latest version of iTunes. My current firmware is 4.1 and I have tried to restore 4.1 factory and also the latest update from apple. Neither has worked. When I try to restore I get several different error codes including 1013, 21, and a couple of others I can't quite remember. What am I doing wrong here?!