Jailbreak 4.3.1 Untethered On Windows With Sn0wbreeze 2.5 – How To


by casey on April 5, 2011

iH8sn0w has released Sn0wbreeze 2.5 to do an untethered 4.3.1 jailbreak on Windows operating system on devices iPhone, iPad, iPod Touch and Apple TV 2G. We have already covered PwnageTool 4.3 for untethered JB (Mac users can go down to get their links and guides). Remember PwnageTool is only for the Mac OS users. For Windows users we have sn0wbreeze. We are here to show you a HOW TO GUIDE.

Sn0wbreeze 2.5 can create custom firmware iOS 4.3.1 for iPhone 4, iPhone 3GS, iPhone 3G, iPod Touch 3G, iPod Touch 4G on Windows OS. Other than the mentioned basebands, it will not work.

ultrasn0w now works for basebands (01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00)
ultrasn0w is NOT compatible with the folllowing basebands! (02.10.04 / 03.10.01 / 04.10.01 / 05.14.02 / 05.15.04)
iPhone 3GS users can upgrade to iPad 06.15.00 basebands and after that use Ultrasn0w for the unlock

Remember Sn0wbreeze 2.5 uses the same exploit made by Stefan Esser. So a big thanks to Esser for a great work.


NOTE: If your iOS device is not relying on carrier unlock, we recommend to use Redsn0w 0.9.6 RC9 for Windows and Mac as that was much easier for untethered iOS 4.3.1 jailbreak. You can get that step by step guide posted here.



  • Launch Sn0wbreeze 2.5. Read the warning and press OK.
  • Press the blue button at the right bottom to proceed to the next step.

sn0wbreeze 2.4 Untethered 4.3.1 Jailbreak Windows - 1


  • Browse and select the iOS 4.3.1 IPSW firmware file that you have download in STEP 1.
  • Press the blue button to proceed.


  • Sn0wbreeze 2.5 will start doing verification of your firmware file. Once its completed, it will prompt you a message saying its verified now.
  • Press the blue button to proceed.

sn0wbreeze 2.5 how to guide jailbreak


  • Select “Expert Mode”.
  • Then select ‘Build IPSW’. It will then start creating a custom firmware 4.3.1 for you.
  • REMEMBER If you are relying on unlock then you should choose “BaseBand Preservation Mode” and not Expert Mode.

baseband preservation mode

sn0wbreeze 2.5 images

create custom firmware


  • Once completed, it will prompt a “Done” message.

sn0wbreeze 2.4 Untethered 4.3.1 Jailbreak Windows - 8


  • It will prompt you the instruction to enter in DFU mode Connect your device with PC.
  • For that, press and hold POWER and HOME button for 10 seconds.
  • Now let go the POWER button and keep on holding the HOME button for 10 seconds again.
  • You device will go into the DFU mode.

Enter DFU mode

  • Following screen will be displayed telling you that you have entered in the Pwned DFU mode.

iReb Sn0wbreeze 2.5


  • Launch iTunes 10.2.1. Select the iOS device from the sidebar in iTunes software.
  • Press the Shift on your keyboard and then press Restore (DO NOT UPDATE).
  • It will ask you the location of custom firmware that it has created. Select the custom firmware file.

iPhone Recover IPSW iTunes


  • Let the iTunes do rest of the process for you. It will do few automated steps. Do not try to interrupt it in the middle. Let it to take its time.
  • It will be showing you a progress bar. Once its installed, your device will be jailbroken with iOS 4.3.1 firmware installed in it.

Thats It !!! Congratulations!!! You have successfully jailbroken iOS 4.3.1 untethered using sn0wbreeze 2.5 on Windows.

How To Unlock iOS 4,3.1 iPhone 4 3GS With Ultrasn0w Fixer [How To Guide]

Ultrasn0w iOS 4.3.1 as they have promised is released. It will be compatible with basebands which includes 01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00.

Update: Ultrasn0w 1.2.1 Unlock iOS 4.3.1 iPhone 4 and iPhone 3GS

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Mac Users can get the following guides we have already covered:

UPDATE: Sn0wbreeze 2.5.1 will be released soon if few of you are facing some errors.

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  • Greenday10111

    There’s a way to fix the unlock on ultrasnow in 4.3.1! First install ultrasnow then add this repo http:/djayb6.com and install the ‘ultrasnow 4.3.1 unlock fixer’ You phone will now be unlocked on 4.3.1! Please credit me

  • http://twitter.com/obolonskyi Misha Obolonskyi

    damn! error 37 :(

    • Djay_mo14

      check the update in the last of this guide

  • cordovanian

    Doesn’t work with iphone 3gs old bootrom with 1.59 modem. Throws error 37 in the end

    • Djay_mo14

      check the update in the last of this update

  • Tttt

    Awesome…. Worked 1st time!

  • Akmalanp

    Hi I have 3GS factory unlock If i updated to iOS 4.3.1 from direct to iTune. how can I jailbreak it.nCurrently I use iOS 4.2.1. I am waiting an earliest & kind response from anyone who knows about it very well.

  • Sdodge2

    i went to custom restore in itunes, it extracted and prepared to restore iphone 4, but then gave me error 1600…any tips or suggestions?

  • Sdodge2

    i went to custom restore in itunes, it extracted and prepared to restore iphone 4, but then gave me error 1600…any tips or suggestions?

  • Sdodge2

    i went to custom restore in itunes, it extracted and prepared to restore iphone 4, but then gave me error 1600…any tips or suggestions?

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