Updating pwned iphone
Since there is no Pwnage Tool for i OS 5, hence no Sn0wbreeze. You can now proceed to unlock i Phone 4, 3GS on i OS 5.
This is why currently you can build custom i OS 5 firmware for i Phone 4 or i Phone 3GS using only Redsn0w for Mac.
WARNING for i Phone unlockers: You should stay away from i OS 5 update as this will update their baseband and result in loss of unlock.
You should also stay using Redsn0w in the regular way to jailbreak i OS 5 on your i Device, which requires you to be i OS 5 first before proceeding. Browse and select the IPSW file for your i Phone you earlier downloaded in Step 1. Let Redsn0w build custom IPSW and save it on your desktop. Once the build is completed, you will be notified by Redsn0w. In order to restore your i Phone to this custom built i OS 5 firmware, you need to enter the Pwned DFU mode. Without releasing the Power button, also hold down the Home button for 10 seconds. Without releasing the Home button, release the Power button BUT KEEP HOLDING the Home button for 15 seconds. Now Redsn0w will run the Limera1n exploit and this will make your device accept custom IPSW from i Tunes.
Try the following tips to resolve the error message.
First, verify that the computer running i Tunes has an active internet connection and is able to access the outside world.
This can happen when updating an i Pad 2 jailbroken with Saffron gets updated to i OS 5.An easy way to test this is to disable those types of filtering and see if i Tunes can restore the i Phone or i Pad as expected.Sometimes there is a blip in internet connectivity, and simply waiting a few minutes and trying again later can resolve the issue on its own.i Tunes is too old and couldn't read the i Phone in Recovery or DFU Mode. As you may already know, Redsn0w can jailbreak i Phone 4 and i Phone 3GS on the latest i OS 5 firmware. The only exception is i Phone 3GS old bootrom, for which the jailbreak is untethered.