How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband (Mac)

How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband (Mac)

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These are instructions on how to upgrade your iPhone 4 GSM or iPhone 3GS to iOS 5.1 without updating your baseband. This will maintain the potential to unlock if you are on a supported baseband.

Step One
Download the latest version of RedSn0w from here and place it in a Pwnage folder on your Desktop.
How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband (Mac)

Step Two
Download the iOS 5.1 firmware for your device from here and place it in the same Pwnage folder.
How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband (Mac)

Step Three
Double click the RedSn0w archive to extract it then double click the RedSn0w icon to launch the application.
How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband (Mac)

Step Four
Click Extras from the RedSn0w main menu.
How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband (Mac)

Step Five
Click Custom IPSW from the Extras menu.
How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband (Mac)

Step Six
Select your iOS 5.1 firmware from the Pwnage folder on your Desktop and click Open.
How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband (Mac)

Step Seven
RedSn0w will now customize an IPSW file for you.
How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband (Mac)

How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband (Mac)

Step Eight
RedSn0w will inform you once your IPSW has been created successfully. Click the OK button.
How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband (Mac)

Step Nine
Click Pwned DFU from the Extras menu.
How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband (Mac)

Step Ten
Connect your device to the computer via USB and power it off. Then click the Next button to continue.
How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband (Mac)

Step Eleven
Hold down the Power button for 3 seconds.
How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband (Mac)

Step Twelve
Without releasing the Power button, also hold down the Home button for 10 seconds.
How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband (Mac)

Step Thirteen
Without releasing the Home button, release the Power button BUT KEEP holding the Home button until your device is detect in DFU mode.
How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband (Mac)

Step Fourteen
You device will now be exploited with LimeRa1n.
How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband (Mac)

Step Fifteen
Once its done you will be in Pwned DFU mode.
How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband (Mac)

Step Sixteen
Launch iTunes by clicking its icon in the dock.
How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband (Mac)

Step Seventeen
Select your device from the list on the left, then hold down the Option key and click Restore.
How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband (Mac)

Step Eighteen
Select the NO_BB custom IPSW from the Pwnage folder on your desktop and click Open.
How to Upgrade Your iPhone to iOS 5.1 Without Updating Your Baseband (Mac)

Step Nineteen
You iPhone will now be upgraded to iOS 5.1 without updating the baseband.
ReutM - March 22, 2013 at 2:04pm
try this one, http://www.rapidunlockers.com/ I have unlocked my phone on very very fast (about 6 hours total) and cheap, now i can update to any version without having to worry that my phone will be locked ever again. Only 9.99$ for phone unlocks!!
Okinvo - January 22, 2013 at 3:30pm
At step nineteen iTunes says The iPhone could not be restored. This device is not eligible for the requested build. I tried to restore using the correct NO BB etc.ipsw Might this be a iTunes version problem ?
0di3 - January 7, 2013 at 3:01am
does this work for 6.0 or 6.0.1?
Tony - June 21, 2012 at 7:08am
Followed this procedure and now my phone says 'No SIM' all the time. Tried restoring trough iTunes (non-jailbreak) and even that now says the same! iPhone 4, using 5.1.1. No idea what my baseband is now - how do I find out? Thanks for your help!
Tony - June 21, 2012 at 7:26am
Found my baseband: 4.12.01
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