Ultrasnow 1.2.3 Released to Unlock iOS 4.3.3 on iPhone 4 and iPhone 3GS

Today iPhone Dev Team has released Ultrasnow 1.2.3 for unlocking iOS 4.3.3 on iPhone 4 and iPhone 3GS. Ultrasn0w 1.2.3 does not include any new baseband support but it unlocks those devices which are currently on unlockable baebands.

The current version of Ultrasn0w can unlock the following basebands:

  • 01.59.00
  • 04.26.08
  • 05.11.07
  • 05.12.01
  • 05.13.04
  • 06.15.00

Ultrasnow 1.2.3 doesn’t support the following basebands:

  • 02.10.04
  • 03.10.01
  • 04.10.01
  • 05.14.02
  • 05.15.04

So, if you are still on unlockable baseband, you can restore your iPhone 4/3GS with custom iOS 4.3.3 and then unlock with this updated Ultrasn0w. There are two tools available to build custom iOS .iPSW file. One is PwnageTool which runs on OS X only and another is Sn0wbreeze which is compatible with Windows operating systems. These tools not only preserve the baseband to retain the existing unlock but also jailbreak iOS 4.3.2 (untethered). They can also be used to add custom animations (like bootlogo), to add pre-installed Cydia packages and sources and to hacktivate the device.

Here is the step by step guide to unlock iOS 4.3.2 using Sn0wbreeze 1.2.2.

Step 1: Backup your device using latest version of iTunes before starting the actual process.

Step 2: Restore to custom iOS 4.3.3 cooked by either PwnageTool 4.3.3 or Sn0wbreeze 2.6 via iTunes.

Step 3: Once your device is jailbroken, connect it with internet using a WiFi connection.

Step 4: Launch Cydia from your device Springboard.

Step 5: Tap on Changes and then on “Refresh “.

Step 6: After the changes are refreshed, use the Search option and type Ultrasn0w to search and install it.

Step 7: Restart iPhone after installing Ultrasn0w and you will see the carrier name and signal bars in the top left corner.

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Author: A. Usman

Loves new tech, especially from Apple and Google.


  1. S0 . . . . . I’m sorry but being in oz if i use Ultrasnow with 4.2.1, Modem 5.15.will i have to unlock my already unlocked iphone sorry i’m confused with that bit.

  2. The unlock worked great, but after 2 days later it went to no service.
    I tried rebooting and and no luck. I also tried to reinstall Ultrasnow but now it says
    “Unable to activate data newtwork” any suggestions on what to do?

    Iphone 3G
    FW 4.2.1
    Baseband 06.15.00.

  3. It’s important to mention here that iPad baseband 06.15 disables GPS functionality on your iPhone, so that is a serious consideration.

    1. u can actvate gps easily

      download a ssh client.
      get into the var folder and look for locationid and delete any cache files in there.
      after that ur gps will work like a charm.

  4. just use ultrasnow 1.2, seems to be working but in fact not, iphone is searching for network but after 5 min, it says network not available!!
    when i go to network settings, it says: impossible to load network list…
    please any solutions
    jailbreak and firmware 4.2.1
    baseband: MB489FB

  5. Great work guys, Has the Redsn0w update for windows users been released yet and if so, do you have a link to it please? Also a tutorial would be of great help. I already have a friends phone jb’n on Limera1n, i assume that i will have to restore then re-jb again or no?

    All help greatly appreciated…………

  6. I don’t understand, if I just update to 4.2 or 4.2.1 won’t I get the requested baseband that is possible to unlock? Or do I have to download this iPad file for my iPhone 3g?

    Can’t I just update, JB with redsn0w and then download ultrasn0w via Cydia?

    Thanks for any help :) Awesome site btw

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