I have a jailbroken ipod touch on ios 4.2.1 and want to update to 5.1.1. I've tried everything I can think of and everything I could find online but I keep getting an error when I try to do a restore. Can anyone help me? I've tried a simple restore to the 5.1.1 ispw I downloaded. I tried a restore to the backup I made before my jailbreak. I tried Tinyumbrella also. Any other suggestions?