So I tried to upgrade my iphone 4 from 4.1 to 4.2.1 since the untethered jailbreak is out. I used tinyumbrella to preserve my baseband. The update seems to go ok, I get the status bar on the phone and then it switches to recovery mode. This is where, with 4.1, I would use tinyumbrella to kick it out of recovery. Well tinyumbrella won't kick it out of recovery. The phone reboots, but goes back to the recovery screen. I downgraded back to 4.1, and tinyumbrella is able to kick it out of recovery on 4.1, but not on 4.2.1. Any thoughts? I tried a couple different cable and computers.