Update and Jailbreak iPhone 4 IOS 4.3 to IOS 5.0 I am trying to update a jailbroken iPhone 4 IOS 4.3 to IOS 5.0. I have acquired the needed things from this link http://www.jailbreaknation.com/jailbreak-ios-5-5.0-on-iphone-4-ipod-touch-ipad-with-redsn0w. First, I got the error 3194 when when itunes was trying to verify the .ipsw file with apple. I fixed the problem by downloading TinyUmbrella and turning on the TSS server. But now I get a 1604 error when itunes trys to prepare the iPhone for restore. I sort of fixed that buy putting the iPhone into Pwned DFU mode using IREB or Redsnow 0.9.9b8. Now I'm getting error 1600. How do I fix this?

Extra Info:
Itunes version: 10.2
Yes I have tried normal DFU mode and Recovery Mode.

Thanks In Advance.
I was having same problem while updating iPhone 4 from 4.3.3 to iOS 5.0 and then i got the solution.
Updated my itunes but updating to ios 5.0 was not possible as apple is not signing 5.0 so i downloaded ios 5.0.1 and use sn0wbreeze to build custom ipsw put my iPhone in dfu mode and shift restore my iphone through itunes.
Bingo i was updated on i0s 5.0.1 with preserving baseband and then i used gevey ultra sim for unlock.
Hope this helps.