Update to iOS 5.1.1 – Preserve Baseband (Mac & Win)

How to Update to iOS 5.1.1 – Preserve Baseband for Mac & Windows on iPhone 4, 3GS on iOS 5.1.1 Update.
We have received many comments on our Facebook regarding the way to preserve baseband while upgrading to iOS 5.1.1 for this reason we decided to push this post how to preserve baseband while updating to iOS 5.1.1 in order to  keep your unlock

Update to iOS 5.1.1 – Preserve Baseband

How to Upgrade Your iPhone to iOS 5.1.1 Without Updating Your Baseband (Mac & Win)

Required for Update to iOS 5.1.1 – Preserve Baseband :

• Download iTunes 10.6.1
• Download the latest version of Redsnow from
• Redsn0w 0.9.11b4 for OS X
• Redsn0w 0.9.11b4 for Windows
• Download iOS 5.1.1 firmware for your device.

Step 1: After downloading the required Redsnow and iOS 5.1.1 firmware put them into a folder that can be easily identify later.
Step 2: Extract Redsnow by double clicking on Redsnow icon then launch it.
Step 3: After launching Redsnow you will be informed by the screen below then select Extras button from the main menu.

Step 4: Click on Custom IPSW from Extras menu

Step 5: Select your iOS 5.1.1 firmware from your computer and click Open.
Step 6: Now RedSn0w will customize your IPSW file.


Step 7: Once your IPSW has been created RedSn0w will inform you by the message below then Click the OK button.

Step 8: Click Pwned DFU from the Extras menu as you see on the screen below.

Step 9: Turn your device off and connect it to the computer via USB Then click the Next button to continue.

Setp 10: Now you have to put your device in DFU mode by following the steps below as you will see on the screen.
How to Put iPhone in DFU Mode.

• Hold down power button and home button both at the same time for 10 seconds.
• After the 10 seconds release the power button and still pressing on the home button for another 10 seconds.

Step 11: Your device will now be exploited with LimeRa1n.
Step 12: Once its done you will be in Pwned DFU mode.
Step 13: Now Launch iTunes by clicking on it’s icon then select your device from the list on the left, then hold down the Option key and click Restore.

Step 15: Then Select the NO_BB custom IPSW from the folder you saved in and click Open.

Step 16: Your iPhone will now be upgraded to iOS 5.1.1 with preserved Old baseband, and You are done.
Now you can wait for the Upcoming Absinthe 2.0 to Jailbreak your iPhone and to be able to Unlock it with Ultrasn0w or Gevey Ultra S.