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Update iPhone 3GS/3G Baseband 05.14 or 05.15 to 06.15.00 Using PwnageTool 4.1.3 [How-To Guide]

The latest version of Ultrasn0w (v1.2) can not unlock iPhone 3GS/3G baseband 05.14.xx or 05.15.xx. To unlock these basebands, first you must use PwnageTool 4.1.3 to update your baseband to 06.15.00 and then you can unlock your iPhone with Ultrasn0w 1.2. This guide will explain you how you can use PwnageTool 4.1.3 to upgrade your iPhone 3G/3GS baseband to 06.15.00.

Update: Instead of using PwnageTool 4.1.3, now you can use Redsn0w 0.9.6b5 to update iPhone 3G/3GS baseband from 05.14/05.15 to 06.15.00. It don't require you to download iPad iOS 3.2.2 IPSW plus its available for both Windows and Mac OS X users.

PwnageTool 4.1.3 Unlock Edition
Before you may proceed, please read this official disclaimer by iPhone Dev-Team:


  • 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.
  • 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).
  • 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).

Steps to Update iPhone 3GS/3G Baseband 05.14 or 05.15 to 06.15.00 Using PwnageTool 4.1.3:

  1. Download PwnageTool 4.1.3 - Unlock Edition from here
  2. Download iPad iOS 3.2.2 from here (iPad1,1_3.2.2_7B500_Restore.ipsw)
  3. Download iOS 4.1 firmware for your iPhone (3GS|3G) from here
  4. Place iOS 4.1 IPSW for your iPhone, iPad iOS 3.2.2 IPSW and PwnageTool 4.1.3 in one directory as shown in the screenshot below:
  5. PwnageTool 4.1.3 Unlock Files

  6. Launch PwnageTool and select iPhone 3GS, 3G, 4 option as shown in the screenshot below:
  7. PwnageTool 4.1.3 Unlock Edition

  8. Now PwnageTool will detect iOS 4.1 IPSW for your device automatically. If it fails to detect, switch to Expert mode and browse to the IPSW you downloaded in step 3 manually.
  9. PwnageTool 4.1.3 Unlock

  10. Now PwnageTool will provide you with the option to upgrade your iPhone baseband to an iPad baseband. Click Yes to continue.
  11. PwnageTool 4.1.3 Unlock Edition

  12. PwnageTool will detect iPad iOS 3.2.2 IPSW automatically. If it fails to detect, switch to Expert mode and browse to the IPSW you downloaded in step 2 manually.
  13. PwnageTool 4.1.3 Unlock Edition

  14. Click YES to create iOS 4.1 custom IPSW for your iPhone
  15. PwnageTool 4.1.3 Unlock Edition

  16. Click NO, as you are doing this for unlock purpose only.
  17. PwnageTool 4.1.3 Unlock Edition

  18. Now wait while PwnageTool cooks iOS 4.1 custom IPSW which will jailbreak your iPhone on iOS 4.1 when restored through iTunes.
  19. PwnageTool 4.1.3 Unlock Edition

  20. If your iPhone have been previously jailbroken using PwnageTool click YES, otherwise click NO.
  21. PwnageTool 4.1.3 Unlock Edition

  22. Once done, connect your iPhone to your Mac through USB cable and hold down the Power and Home button simultaneously for 10 seconds, after 10 seconds release the Power button but continue holding the Home button until PwnageTool detects your iPhone in DFU mode.
  23. PwnageTool 4.1.3 Unlock Edition

  24. Once done, you will see iOS 4.1 custom IPSW file for your iPhone on your desktop.

How to Restore iOS 4.1 Custom IPSW Through iTunes:

Select Device from iTunesOnce you have successfully created the iOS 4.1 custom IPSW through PwnageTool and your iPhone is in DFU mode, launch iTunes and click on the name of the device from the side panel to view the summary page.
Restore Through iTunes
Now you will see two buttons, Check for Updates and Restore. Hold down the ALT key (SHIFT for Windows) and click on the Restore button to browse for iOS 4.1 custom IPSW file you just created with PwnageTool 4.1.3.

iTunes Restore Firmware
Now wait until iTunes restores the custom cooked iOS 4.1 IPSW on your iPhone. If you see iTunes error 1004 or 1015 during the restore, don't panic because the firmware restore on your device is now complete. All you need is to kick your device out of recovery mode by using RecBoot or TinyUmbrella software.

Download RecBoot from here and use the guidelines here to kick your device out from recovery mode. Incase RecBoot fails, you can always try the new TinyUmbrella v4.1.9 to kick your device out from recovery mode.
Recboot - Kick Out of Recovery Mode

Unlock iPhone 3GS/3G Baseband 06.15.00 With Ultrasn0w 1.2:

Once your iPhone has been jailbroken on iOS 4.1 by using the above procedure, your iPhone baseband should be 06.15.00. You can now use Ultrasn0w 1.2 to unlock your iPhone. Now you can use step-by-step guide here to unlock iPhone 3G/3GS baseband 06.15.00 on iOS 4.1.

Update#1: Download TinyUmbrella (Fix Recovery) to fix iOS 4.2.1 recovery mode loop issue.

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Leave a message...

    Moi5 years, 10 months ago

    I don’t get the step/option to upgrade to ipad firmware. I install the iphone restore bundle because pwnage tool showed me ‘wrong bundle’. Please can u help_

    beckz335 years, 10 months ago

    Thanks a Million!! I dont know that much about iphones, but your directions were ON POINT!! And the easiest for me to follow…(out of all the ones I looked up!) I’m so excited that my iphone is unlocked and works! Could have never done it without your help…So big UPz to you Wolverine =)

    brockpc5 years, 11 months ago

    Thanks for making that easy to comprehend!