The good news is that UltraSn0w 1.2 is finally out now and it will unlock iOS 4.2.1 and 4.1 on the iPhone 3G and 3GS. The bad news is that unlocking is pretty complicated this time around, but we are here to help to make it a bit easier. If your iPhone has a baseband of 05.14.02 or 05.15.01 you will need to update your baseband to 06.15.00, which is an iPad baseband that came with iPad iOS 3.2.2. If your iPhone has baseband 01.59.00, 05.14.04, 05.12.01, 05.11.07, or 4.26.08, then you can simply install UltraSn0w from Cydia. Baseband 05.14.02 or 05.15.01 users need to update to baseband 06.15.00 which is unlockable. We strongly suggest that you take the time to read this before continuing.

We will help you learn how to update your iPhone 3G / 3GS bsebadn to 06.15.00 to unlock the iPhone later.

WARNING:

YOU DO THIS AT YOUR OWN RISK!  PLEASE UNDERSTAND THE CONSEQUENCES OF UPDATING TO 06.15.

1. There is no way to come back down from 06.15, and there’s no hiding the baseband version from Apple.  You’ll be voiding your warranty in a very obvious way.
2. If some future baseband comes out with a critical fix, you won’t be able to update to it if it remains down in the 05.xx sequence (then again, you wouldn’t update to it if you wanted to keep your unlock anyway).
3. Starting with FW 4.2.1 if you have 06.15 on your iPhone you won’t ever be able to restore to stock firmware (it will fail).  You’ll need to only restore to custom IPSWs (then again, if you’re unlocker you should already be doing that).

Certainly don’t update to 06.15 if you don’t need to!  Only do this if you need the unlock and you’re stuck on 05.14 or 05.15, and you’re willing to assume the above risks.

How To Update iPhone 3G / 3GS Baseband to 06.15.00 With PwnageTool 4.1.3:

Steps 1:

Download the stuff linked below:

• Download PwnageTool 4.1.3
• Download iOS 4.2.1
• Download iOS 4.1
• Download iOS 3.2.2 (required for baseband update)

Step 2:

Open the downloaded PwnageTool.dmg and copy the PwnageTool.app to your desktop/any folder and execute it from there. Hit the OKbutton.

Step 3:

Now select Expert Mode from the top left side of the window.

Select your iDevice and hit the Nextbutton.

Step 4:

Now hit the Browse for IPSW button and select iOS 4.2.1/4.1 firmware for your device (downloaded from Step 1).

At this point, you will be asked if you want to update your baseband to 06.15.00. If you are on 05.14, 05.15, or later and depend on the unlock, hit the OKbutton. If you do NOT need the unlock, hit No. (Again, we strongly recommend that you read the warning above AND read this carefully before deciding to upgrade your baseband.)

If you previously hit Yes, PwnageTool will once again ask you to Browse for IPSW. This time, select the iPad iOS 3.2.2 IPSW (downloaded from Step 1).

Step 5:

On next screen, Select General and hit the Next arrow button.

Step 6:

Select Activate the phone option if you’re on unofficial carrier.
Note:  Do NOT select Activate the phone option if you’re on an official carrier ie. AT&T.

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Step 7:

Keep hitting Next button until you’re back to the same screen where you selected General, and now Select the Build Option and hit Next.

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PwnageTool will prompt you to select a destination folder to save custom iOS 4.2.1/4.1. Save it to an easy to access location.

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PwnageTool then start to build your Custom IPSW.

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During the build process it’ll prompt you for your admin password. Put it in and hit OK.

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It will then ask you if your iPhone 3G, 3GS, 4 has been Pwned before. Hit Nofor a more thorough restore.

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Step 8:

Once the custom IPSW has been built, PwnageTool will ask you to connect your iDevice to your computer. Once your device is detected, you’ll be instructed to put your iDevice into DFU mode. This can be done by pressing and holding the power + home buttons for 10 seconds, then releasing the power button but continuing to hold the home button for 10 seconds.

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Once the iPhone/iPod Touch is in DFU mode, the follow popup message will appear. (iTunes will also pop-up)

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Step 9:

In iTunes, hold the Alt/Option key and hit Restore. From the popup window, browse to the Folder where you saved custom iOS 4.2./4.1 and select you custom .ipsw file that you just created and click Open Button. (Make sure you’re selecting custom firmware, NOTthe official one.)

iTunes will now restore the firmware on your iPhone. This can take up to 10 minutes. When it is done though, you will have successfully jailbroken your iPhone 3G / 3GS to iOS 4.2.1 / 4.1 with an updated baseband 05.15.00 with PwnageTool 4.1.3. Now your iPhone is ready to be unlocked and you can follow our step-by-step guide on [How To] Unlock iPhone 3G / 3GS On iOS 4.2.1 With UltraSn0w 1.2.

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Authors: TechHead

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