I need to find away to restore my tethered IOS 4.3.4 with redsno0w 0.9.8b3 back to factory settings. I have modified the host file and used tinyumbrella to no avail as when the system boots up I have to use redsn0w to force reboot. This process kills the restore and ITunes errors out with error 21. Any idea how to restore back to factory setting?