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?
Itunes version: 10.2
Yes I have tried normal DFU mode and Recovery Mode.
You can't update your phone to iOS 5.0 Not even if you have your SHSH saved. So nothing you do will allow you to install 5.0 right now. At least for the time being.
Your only option is 5.01. The problem is that apple is no longer signing 5.0 and no shsh blobs will help you neither because a new security measure implemented on all 5.X
So if you need an unlock in order to use your phone I would highly recommend not updating to 5.01 because UltraSnow is currently not working on 5.01 despite of what baseband you have. No even with 1.59 baseband (but this is just until ultrasnow is updated to work on 5.01)
If you don't need an unlock then you can safely update to 5.01 and do a tethered jailbreak using the latest redsn0w and pointing the ispw to 5.0
And before doing anything please update to the latest iTunes.
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.
You need to edit your hosts file and remove all the references to the Apple server. Then start the update from PWND mode... except you're not updating, you're restoring the phone. Let me know what it does...
Now Connect your iDevice to the computer and hold the Shift Key and Click on Restore in iTunes and browse for the IPSW file you downloaded.
If you are a non-jailbreak user or If this doesn’t help then try another solution
Locate your hosts file (/etc/hosts or c:\windows\system32\drivers\etc\hosts)
Open the hosts file with Administrator privileges using Notepad.
Add the following lines to the very bottom of the hosts file:
Connect your device to the computer
Put device into DFU Mode by turning your device off and then holding down the sleep and power button for 10 seconds, then release the power button but hold onto the home button until iTunes tells you that the device is now in recover mode
Use the iTunes Restore feature as usual with the iOS device
If you want you can remove the 18.104.22.168 gs.apple.com line from your hosts file again so that iTunes can properly update as usual.