Build Custom iOS 6 IPSW to Preserve iPhone 4 or 3GS Baseband with Redsn0w 0.9.15b2

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The latest version of redsn0w now supports building custom iOS 6 firmware to preserve your baseband. Here’s how to build your own custom iOS 6 firmware.

UPDATE: If you encounter error 2601 or 14 during restore, use the latest redsn0w 0.9.15b3.

Before we begin, do you know that you can now officially unlock AT&T iPhone or some select worldwide mobile network?

Editor's note: learn more by reading our ebook on starting your own iPhone repair & unlock business

Let’s get straight to business:

1. Download the latest version of redsn0w at the bottom of this post.

2. Download original iOS 6 IPSW for iPhone 4 (GSM) or iPhone 3GS directly from Apple.

3. Launch redsn0w and go to Extras > Custom IPSW.

4. Point to the IPSW you just downloaded in Step 2. If you have a 3GS, you will be prompted whether you have a 3GS with old or new bootrom. Select appropriately.

5. Redsn0w will start building custom iOS 6 while removing the files that will update your baseband. Once completed, you will find this file on the same file path as the original IPSW with the prefix “NO_BB…” followed by the IPSW file name.

6. Be sure to pawn DFU your iPhone with redsn0w by going to Extras > Pwned DFU. Simply follow the on-screen instructions.

7. Once your iPhone is in DFU, launch iTunes and press Shift+Restore (Windows) or Option+Restore (Mac). Be careful not to select the wrong IPSW during restore! If you get error 3194, you need to edit your hosts file. See here.

8. Wait for it to finish. Your iPhone will attempt to reboot and may stuck on the Apple logo with empty progress bar due to tethered jailbreak.

9. Launch redsn0w again > Extras > Just Boot. Follow on screen instructions.

10 .Your iPhone will boot up normally and follow the instructions here to unlock with ultrasn0w fixer.

That’s it! If you encounter any issue, leave your comments below.

Download links for redsn0w 0.9.15b2

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Comments & Discussion

  1. what version of itunes should i use? i recently use v. 10.4.1 to fix an iphone 3gs after i tried to update to iOS6, which i appreciate is working, but i cannot update to iOS6 with that version, well the problem is that i cannot find e the file with the "no BB" name change, and is not being created in the same path where i downloaded the original file from Apple.

  2. when i try to restore ios 6 itunes messaging me that " the iphone cannot be restored at this time because the iphone software update server could not be contacted or is temporarily unavailable"
    while full internet connection is available. help!!!!!!!

  3. my iphone 3gs fabricated in 2011 week 27 actually ipad baseband . i tried to upgrade it to os 6 and all steps are going well but when i got to itunes version 11.0.1 i stuck on message " the iphone cannot be restored at this time because the iphone software update server could not be contacted or is temporarily unavailable"
    and i checked the hosts there is no error 3194. plz help !!!!!!!

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