Do you have your iPhone 4 unlocked using Gevey SIM and want to upgrade to iOS 5? If so, you can unlock iPhone 4 running iOS 5 using Gevey SIM but you’ll need to follow few steps before doing that. In order to unlock iOS 5 with Gevey SIM, you’ll need to preserve your unlockable iPhone 4 baseband.
You’ll need the new Redsn0w’s “Custom IPSW” option which is included on Mac OS X only. Windows version of Redsn0w 0.9.9b5 coming soon along with new Ultrasn0w later today to unlock iOS 5 (only for current unlocked devices, no new unlock).
STEP 1: Connect your iPhone 4 into you computer then open Redsn0w 0.9.9b5.
STEP 2: Now select Extras then “Custom IPSW” option so that you can create your pre-jailbroken custom firmware.
STEP 3: Redsn0w will start cooking your custom IPSW and you’ll get it in few minutes.
STEP 4: Once you get your firmware, select ‘Pwned DFU’ from RedSn0w.
STEP 5: Follow the on-screen instructions to get your iPhone in DFU mode.
STEP 6: Once it’s in DFU mode, close Redsn0w then open iTunes 10.5 downloaded above and you should get your iPhone in Recovery Mode message.
STEP 7: Now hold the Option key on Mac and hit Restore. Point iTunes to your iPhone 4 Custom iOS 5 IPSW which begins with NO_BB. (WARNING: Don’t select the stock one or you’ll lose your unlock)
Finally, you will need to use Gevey SIM with the way you knew. In case you’re not aware, here’s a video showing how to use Gevey SIM on iPhone 4:
As a side note, we recommend you stay tuned for some big news later today since Ultrasn0w for iOS 5 coming and Redsn0w 0.9.9b5 for Windows will be out too soon.If you found this post useful, hopefully hit the +1 (recommend) button ⇉
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