How to unlock iPhone 4 on iOS 5.1 with Gevey SIM? Well, if you use Gevey SIM to unlock your iPhone 4 on unofficial carrier and you are one from who interested in the newly iOS 5.1 which released in the new iPad Media Event, so you have to follow the below procedure to keep your Gevey SIM working on your iPhone 4.
As most unlockers know that Gevey SIM can only unlock iPhone 4 on specific basebands, so when you decide to update to any new version of iOS, you MUST update to custom firmware. As updating your iPhone 4 to stock iOS 5.1 will kill your Gevey SIM functionality. So we writing this article to show you how to avoid falling in this trap.
Before showing you how to unlock iPhone 4 on 5.1 using Gevey SIM – Here’s what we gonna do:
Gevey SIM is able only to unlock iPhone 4 on those basebands (4.10.01 – 3.10.01 – 2.10.04 – 1.59.00). So in the below guide we will show you how to update your iPhone 4 to 5.1 with preserving the above unlockable basebands. This step can be done using Redsn0w, as it will cook custom firmware which will be used with iTunes to restore your iPhone 4 to iOS 5.1
Required Downloads to Unlock 5.1 iPhone 4 with Gevey SIM:
- Download Redsn0w 0.9.10b6 – Windows / Mac
- Download iOS 5.1 ipsw for iPhone 4 (GSM)
- Download iTunes 10.6 – Windows / Mac
- Gevey SIM – we recommend to buy it from Amazon for secured shipping and delivery.
How to unlock iPhone 4 on 5.1 using Gevey SIM
Step 1: Connect your iPhone 4 with your PC via USB and open Redns0w you just downloaded above.
Step 2: Start Redsn0w, press on “Extras” > “Custom IPSW” and then point Redns0w to iOS 5.1 ipsw firmware that you downloaded above.
Now Redsn0w will start cooking your custom iOS 5.1 ipsw firmware.
Step 4: Now make sure your device is both OFF and PLUGGED IN to the computer before you click “Next”.
At this stage you will be presented with a screen where you will be guided on how to enter DFU mode. Quickly hold “Power” button and then while holding the “Power” button, you will now have to hold “Home” button too. Now after few seconds release “Power” button but keep holding “Home” button until installation begins.
Step 5: Open iTunes, then Restore your iPhone 4 to the Custom iOS 5.1 ipsw (the file name begins with NO_BB).
Congratulations, now you have updated your iPhone 4 to 5.1 with preserving the old basebands, so now you can use Gevey SIM to unlock iPhone 4. If you are new in using Gevey SIM, you can follow the simple steps in the below embedded video:
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