Upgrading to the latest iOS is very simple that you can just launch iTunes and get your device connected and click on Update. However by doing so you will also update your iPhone baseband too. Currently Gevey SIM can’t unlock baseband over 4.10. If you update your phone with iTunes to iOS 5.0.1, your iPhone baseband will be 4.11.08 which can’t be unlocked now.
If you want to unlock your iPhone and want to unlock it too, you can follow our guide below.
- Download Redsn0w 0.9.10 b3 for here (For Windows, you must be in administrator mode to run RedSn0w)
- Download iOS 5.0.1 for you iDevices from here
- Download iTunes. You can visit Apple site for the lastest version
How to update to iOS 5.0.1 keeping your old baseband for unlock:
Step 1: Connect you iPhone to PC via USB cable.
Step 2: Start the Redsn0w (downloaded above) then press “Extract”.
Step 3: On the new screen, select Unlock iPhone 4.
Step 4: Now wait for Redsn0w customizing your IPSW file.
Step 5: On the new screen, select “Pwned DFU”
Step 6: Now it is important. Turn OFF and plugged in your device to PC before clicking “Next”.
Step 7: Now you will be one the new screen with guide to set your phone into DFU mode. Follow the steps below:
- Press and Hold Power and Home Button for 10 seconds. Now you can release the Power button while keep holding Home button for another 10 second.
- Now you are in DFU mode.
Step 8: Now you are done with RedSn0w and you can get back to iTunes. You now can restore your device with the custom iOS 5.0.1 ipws which was created above. Do not click on update or your phone baseband will be updated too.
DONE! Now your iPhone is on iOS 5.0.21 with old baseband.
You also can follow our guide to jailbreak iOS 5.0.1 for iPhone, iPad and iPod Touch from here.