I'm trying to downgrade from iOS 5 beta 3 to 4.3.3. I've used TinyUmbrella and restored 4.3.3 with iTunes however I received the 1013 error and my phone is now stuck in a recovery loop. However, TinyUmbrella can't kick the phone out of recovery mode. When I try, the phone just reboots and it's still in recovery mode. I think I can use DFU mode to exit recovery mode but how can I do this? I can't seem to enter DFU mode from inside recovery mode.