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Saturday, October 15, 2011

Downgrade iPhone 4 iOS 5 Baseband 4.11.08 to 4.10.01 to Unlock with Gevey Turbo SIM

Did you blindly update to iOS 5 without realizing the consequences that it will also update your baseband to 4.11.08 that can’t be unlocked with your Turbo SIM? Thankfully, there’s still a way out, at least for now! Hurry before it’s too late!

Apple is still signing iOS 4.3.5, which means you can still downgrade to this iOS version. It has baseband 4.10.01 that can be unlocked with Gevey Blue Turbo SIM.


1. Download and install iTunes 10.4 or earlier. You will need to remove iTunes 10.5 first.

2. Download iOS 4.3.5 IPSW for iPhone 4 (search on Google, I will post a link soon).

3. Put your device into DFU mode (search a tutorial on YouTube).

4. Connect to iTunes and it will say that your device is in recovery mode and needs to be restored.

5. Go ahead and click shift+restore (Windows) or option+restore (Mac). Select the IPSW you just downloaded.

6. iTunes will verify with Apple server and begins restoring your device. Once completed you will need the official SIM card to activate it. You can use other tools such as TinyUmbrella to confirm that you now have baseband 4.10.01.

7. Now download custom iOS 5 from here.

8. Download latest redsn0w from the Dev Team’s website or from 

Here are the download links:
redsn0w 0.9.9b4 for Windows (version 0.9.9b5 after more testing)

Start redsn0w, go to Extras > Pwned DFU. This allows your iPhone to accept custom firmware.

9. Reinstall iTunes 10.5. Connect your iPhone to your computer.

10. Click shift+restore (Windows) or option+restore (Mac) and select the custom iOS 5 IPSW you just downloaded.

This time your baseband will be preserved while running on iOS 5 and you can unlock it with Gevey Blue Turbo SIM.

Again – do it now because once Apple stops signing iOS 4.3.5, you will be stuck forever!



  1. Is this worked for any one?

  2. has anyone tried this? did it worked?

  3. you can downgrade the ios. But the baseband remain the same 4.11.08 . We have to wait for a new gevey sim. to unlock that baseband.