Unlock iOS 4.3.1 On iPhone 4 3GS With Ultrasn0w Fixer


by casey on April 6, 2011

As we have already told you about Ultrasn0w fixer for iOS 4.3.1 unlock on iPhone 4 and iPhone 3GS on older basebands. The fix is developed by msft_guy and iH8sn0w. Get the HOW TO GUIDE after a break.

If you are unaware, Ultrasn0w was previously unable to unlock iPhone 4 and 3GS devices after untethered iOS 4.3.1 jailbreak. But now you can use Ultrasn0w 4.3.1 fixer to unlock your device. DO NOT take it as a new unlock tool, it can ONLY UNLOCK basebands 01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00.


You need to have a jailbroken iOS device in order for iOS 4.3.1 unlock to work. You can jailbreak your device using Redsn0w 0.9.6 RC9PwnageTool 4.3 or Sn0wbreeze 2.5.

How to Guide To Use Ultrasn0w fixer for iOS 4.3.1 to Unlock iPhone 4 and 3GS

Step 1: Launch Cydia in your jailbroken iPhone 4 or iPhone 3GS

ultrasn0w unlock 4.3.1 fixer - 1

Step 2:  Navigate to “Manage” and then “Sources”

ultrasn0w unlock 4.3.1 fixer - 2

Step 3:

  • Now “Edit” and then “Add”.
  • Type the repo: “http://cydia.pushfix.info”
  • Now “Add Source”

ultrasn0w unlock 4.3.1 fixer - 4

Step 4: Now press “Done”.

Step 5: Now select  ”Pushfix.info” to Install it.

Step 6: Once its done with installation. Go to Pushfix.info. Scroll down to find “Ultrasn0w fixer for 4.3.1”. Select and to install the package. After that it will restart your device.

ultrasn0w unlock 4.3.1 fixer - 6

ultrasn0w unlock 4.3.1 fixer - 7

Thats it! Congratulations! Your device is now unlocked on iOS 4.3.1 on basebands 01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00. Kindly DO NOT use it other than the mentioned basebands.

UPDATE: Those who are still facing issues after using Ultrasn0w Fixer, iPhone Dev Team has updated:

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  • Skelalex

    hi all, need help. i have iphone 4, bought in states, iOS 4.0, was jailbroken. recently by mistake telephone was updated with iOS 4.3.1. baseband of the phone 4.10.01. Is there any chance that i can unlock carrier again? Coz now my wife can use it only at home connected wifi like a small ipad… please can somebody help me, any recommendations

    • Dominic

      No, your iPhone 4 is an expensive iPod Touch….however go to EBay and buy yourself a GEVEY UNLOCK SIM and that will unlock your phone, on 4.3.1 and BB 4.10.01
      I am using it after having the same problem as you!

  • Ljupcho Palashevski

    Perfect! It Works for me…successfully unlocked iOS 4.3.1 / BB 06.15.00

  • Dabassist

    I have done everything on here and still I cannot get any more than 1 bar of signal.

    My BB is 01.59.00 I’m on T-Mobile UK any ideas?

  • Tounsi

    hi,nyou can unlock with gevey sim or rebel sim a bit expenceve tho.nthanks

  • Arslann

    Is there is any chance to unlock iPhone 4 4.3.1 on baseband 04.10.01or iPhone 4 4.2.1 on baseband 03.10.01. Please advise :)

  • kyle v

    Ultra snow does not pop up in the source menu?? what do i do now

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