Update iPhone 3GS / 3G Baseband to 06.15.00 with PwnageTool 4.1.3 for iOS 4.2.1 Unlock [Guide]

A special edition of PwnageTool (version 4.1.3) has been released which can update the baseband of iPhone 3GS & 3G to 06.15.00 so that they can be unlocked using Ultrasn0w 1.2 on the latest iOS 4.2.1 or iOS 4.1 firmware. This is important because basebands 05.14.xx and 05.15.xx are currently not unlockable using Ultrasn0w.

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).

Follow the instructions posted below to update your iPhone 3GS or 3G to 06.15.00 baseband and jailbreak it on iOS 4.1 /4.2.1.


Step 1: Download iPad 3.2.2 firmware file from here (Required for 06.15.00 baseband).
Step 2: Download the required iOS 4.2.1 or iOS 4.1 firmware file.
Step 3: Download PwnageTool 4.1.3 from here.
Step 4: Start PwnageTool 4.1.3 and point it to iOS 4.2.1 / 4.1 firmware file.

Step 5: You will now be prompted to update your baseband to 06.15.00 so that it can be unlocked using Ultrasn0w 1.2.

Step 6: Now point PwnageTool 4.1.3 to iOS 3.2.2 for iPad. PwnageTool will now fetch the exploitable 06.15.00 baseband from 3.2.2 firmware and will replace it the baseband in iOS 4.2.1 / 4.1.

Step 7: Click the next arrow now to allow PwnageTool to create this custom ipsw file for you.

 

Step 8: Now follow the following steps to enter DFU mode:

• Hold Power and Home buttons for 10 seconds
• Now release the Power button but continue holding the Home button for 10 more seconds
• You device should now be in DFU mode

Step 9: You will now have to restore your iPhone to this custom firmware 4.2.1 / 4.1 file. Start iTunes, click on your device icon from the sidebar in iTunes. Now press and hold left “alt” button (“Shift” button on Windows) on the keyboard and then click on “Restore” (Not “Update” or “Check for Update”) button in the iTunes and then release the “Shift” button.

This will make iTunes prompt you to select the location for your custom firmware 4.2.1 / 4.1 file. Select the required custom .ipsw file and click on “Open”.


Step 10: Now sit back and enjoy as iTunes does the rest for you. This will involve a series of automated steps. Be patient at this stage and don’t do anything silly. Just wait while iTunes installs the new firmware 4.2.1 / 4.1 on your iPhone 3GS or 3G. Your iOS device screen at this point will be showing a progress bar indicating installation progress. After the installation is done, your iPhone will restart automatically and you should now have a fully jailbroken iPhone 3GS or 3G with 06.15.00 baseband.


UPDATE 1: A new fixed version of PwnageTool bundle (download here) for iPhone 3GS on iOS 4.1 has been released. Here’s how to use it:


a. Copy PwnageTool that you downloaded in Step 3 to a folder on your desktop. Right click, and then click on “Show Package Contents” as shown in the screenshot below.

b. Navigate to Contents/Resources/FirmwareBundles/ and copy-paste thisiPhone2,1_4.1_8B117.bundle file in this location and then simply close this folder. Now follow Step 4 and onwards as posted in the guide above.


How to Unlock iPhone 3GS & 3G on iOS 4.2.1 / 4.1 Follow the complete step by step guide posted here to unlock your iPhone 3GS and 3G on 06.15.00 baseband, running iOS 4.2.1 or 4.1 with Ultrasn0w 1.2.

You can follow me on Twitter to keep yourself updated on all the latest iPhone jailbreaking and unlocking releases.

[via: redmondpie]

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