If you are looking to update to the iOS 5.1.1 firmware while preserving your baseband then you will be glad to know doing so is probably easier than you think. In fact, in our last Sn0wBreeze how to guide on Jailbeaking your iPhone 4 or iPhone 3GS on the iOS 5.1.1 firmware untethered you still actually preserved your baseband because Sn0wBreeze never updates your iPhone’s baseband period. If you are looking to just update to the iOS 5.1.1 firmware without Jailbreaking and still want to preserve your baseband this involves a slightly different process. Thus, in this how to guide you will learn how to upgrade to the iOS 5.1.1 firmware while preserving your iPhone’s baseband using Sn0wBreeze v2.9.5.
Update To iOS 5.1.1 And Preserve Baseband
Step 1) - The first thing you are going to do is download Sn0wBreeze v2.9.5 from the iJailbreak Downloads Section or from the direct download link below.
Download Sn0wBreeze v2.9.5 (Windows)
Step 2) - Once you download Sn0wBreeze v2.9.5 you will need to extract it to your desktop.
Step 3) - When Sn0wBreeze is extracted launch it by double clicking the sn0wbreeze-v2.9.5.exe file.
Note: You will need to grant Sn0wBreeze administrative privileges.
Step 4) - Upon launching Sn0wBreeze for the first time a few pop-up windows will appear.
Read them over and click the OK button and you will be on the screen depicted below. Read through the notes in read and click the blue arrow to continue.
Step 5) - Through the next screen you will need to click the browse button and select the iOS 5.1.1 firmware by clicking the Browse for an IPSW button.
If you have not already downloaded the iOS 5.1.1 firmware then you can click the Download iOS Firmwares button and proceed to filling out the required information to download your correct firmware file.
Upon selecting the iOS 5.1.1 firmware Sn0wBreeze will begin identifying the firmware file. When Sn0wBreeze has identified the firmware file you will get a success notification. Click the blue arrow to continue.
Step 6) - The next screen you will be presented with 4 options – iFaith Mode, Simple Mode, Expert Mode and Baseband Preservation Mode. The option you will want to click is Baseband Preservation Mode. Do this now.
Step 7) - Sn0wBreeze will now begin creating custom iOS 5.1.1 firmware file that will preserve your current baseband. This process can take anywhere from 5 – 30 minutes depending on the speed of your computer so be patient. Once your firmware file has been created it will be located on your desktop.
Note: Sn0wBreeze has the ability to play PacMan while Sn0wBreeze is creating your custom IPSW.
Step 8 ) - After Sn0wBreeze has created your custom IPSW you need to put your iDevice into DFU mode. To start this process click the OK button.
When you click the OK button you will simply need to follow Sn0wBreeze’s real-time DFU mode instructions. Once you do this, your iDevice will be in DFU mode and you can restore your custom IPSW firmware file.
Step 9) - After following Sn0wBreeze’s real-time instructions EXACTLY as shown, iTunes should launch you will be prompt by Sn0wBreeze saying iReb is successfully running, you can go back to iTunes and SHIFT click the restore button. Once you have done this you can now select your custom IPSW firmware file (located on your desktop) to restore to your iPhone.
Note: Make sure you select the right firmware file that will have the prefix sn0wbreeze_ before the IPSW name (ie: sn0wbreeze_iPhone_4-GSM-5.1.1-9B206.ipsw).
Your iPhone 4 or iPhone 3GS should now be running the stock iOS 5.1.1 firmware with your previous baseband version. Congratulations! If you have any further questions or thoughts please leave them in the comments.