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Need some feedback some say is working other say no???
1. Download the iTunes update to the latest version from the site of Apple (iTunes 10.5), and download the latest version of iOS 5 GM (9A334) iPhone 4.
2. Download the latest sn0wbreeze v2.8b8. Run it on your computer with Windows and create a new sn0wbreeze_iPhone 4-5.0.ipsw, choose to save the new IPSW, only (Baseband Preservation Mode).
3. Use redsn0w (not sn0wbreeze) and put your iPhone into a mode DFU. Make sure that you do not have any gs.apple.com records in the file / etc / hosts. Let it stay just the way the server Apple.
4. In iTunes, click restore to your new sn0wbreeze_iPhone 4-5.0.ipsw.
5. Upon completion of the firmware, you will have a modem with iOS 5 04/10/01 GM (9A334) then follow the instructions to unlock the iPhone 4 with Gevey Ultra Sim ... http://applenberry.com/