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How to Unlock iPhone 4 & iPhone 3GS on iOS 4.3 with Ultrasn0w?

Most of you already know that Ultrasn0w unlock was broken in iOS 4.3 due to ASLR security feature by Apple. Now that iH8sn0w has fixed Ultrasn0w on iOS 4.3 by releasing Sn0wbreeze 2.3b4, you can unlock your iPhone 4 and iPhone 3GS on iOS 4.3. Just download Sn0wbreeze 2.3b4 from here and follow this guide to jailbreak your iPhone using iOS 4.3 using custom IPSW. Once you have successfully jailbroken your iPhone on iOS 4.3, use the guide below to unlock it through Ultrasn0w 1.2.

Supported Basebands:

  • iPhone OS 3.0 ~ 04.26.08 ~ iPhone 3GS
  • iPhone OS 3.1 ~ 05.11.07 ~ iPhone 3GS
  • iPhone OS 3.1.2 ~ 05.11.07 ~ iPhone 3GS
  • iPhone OS 3.1.3 ~ 05.12.01 ~ iPhone 3GS
  • iOS 4.0 ~ 05.13.04 ~ iPhone 3GS
  • iOS 4.1 ~ 01.59.00 ~ iPhone 4
  • iOS 4.0.1 ~ 05.13.04 ~ iPhone 3GS
  • iOS 4.0.1 ~ 01.59.00 ~ iPhone 4
  • iOS 4.0.2 ~ 05.13.04 ~ iPhone 3GS
  • iOS 4.0.2 ~ 01.59.00 ~ iPhone 4
  • iOS 4.1 ~ 05.14.02 via 06.15.00 ~ iPhone 3GS
  • iOS 4.2 ~ 05.15.04 via 06.15.00 ~ iPhone 3GS
  • iOS 4.2.1 ~ 05.15.04 via 06.15.00 ~ iPhone 3GS
  • iOS 4.3 ~ 05.16.01 via 06.15.00 ~ iPhone 3GS [How-To]

Unsupported Basebands:

  • iOS 4.1 ~ 02.10.04 ~ iPhone 4
  • iOS 4.2 ~ 03.10.01 ~ iPhone 4
  • iOS 4.2.1 ~ 03.10.01 ~ iPhone 4
  • iOS 4.3 ~ 04.10.01 ~ iPhone 4

NOTE: To unlock iPhone 3GS running iOS 4.3 with baseband 05.14.02 or 05.15.04, you must first upgrade it to iPad baseband 06.15.00. To upgrade your baseband to 06.15.00, you can either use PwnageTool 4.1.3 or Redsn0w 0.9.6b5 (Recommended).

Steps to Unlock iPhone 3GS Running iOS 4.3 Using Ultrasn0w 1.2:

  1. Open Cydia app on your jailbroken iPhone.
  2. Cydia (Home)

  3. Tap on the Manage tab at the bottom followed by a tap on Sources section.
  4. Cydia (Sources)

  5. Tap on the Edit button on the top-right corner followed by a tap on Add button at the top-left corner of Cydia. Enter as Cydia/APT URL and click on the Add Source button.
  6. Ultrasn0w (Repo)

  7. Now wait while Cydia downloads and updates its repository list.
  8. Updating Repo
    Reloading Data

  9. Once you are done with adding Ultrasn0w repo, tap on the Search tab at the bottom and type Ultrasn0w in the search field.
  10. Search Ultrasn0w

  11. Tap on Install button on the top-right to install Ultrasn0w unlock on your device.
  12. Install Ultrasn0w

  13. Reboot your iPhone once Ultrasn0w installation is complete.

Update#1: Download official Ultrasn0w 1.2.1 to unlock iPhone 4/3GS & fix signal-bars issue on iOS 4.3.1.

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    Janderleynogueira7 years, 1 month ago

    Didn’t work for me. iTunes (10.2.1) prefs set to share, in Advanced, turn on home sharing and enter user and pw and click Create Home Share. (If I click Done, the Shared item on the left dipaspears but under Advanced, there’s an option to turn off Home Sharing so that implies it’s still on) Then on my iPod touch (iOS 4.3) go to the settings/music and enter in the exact same user and pw for home sharing and check the music and video app. Nothing. Also tried without clicking Done. Still nothing.

    Alexis9 years, 11 months ago

    please help me, i have a iPhone 3g with 4.3.4 and BB 5.16.02 and i can’t jailbreak. somebody help me? i trying 3 month each days.

      Pramod9 years, 11 months ago

      Try keeping your comments professional around here. Just use Redsn0w 0.9.9b6.

    Harish10 years, 1 month ago

    Hi Pramod/Wolverine,

    I have an iPhone 3GS (New bootrom) running iOS 4.3, 05.16.02 base band. (I downgraded from 4.3.1 to 4.3). I have SHSH blobs for 4.3, 4.2.1 and 4.2.

    Which is the best way I can jaibreak untethered and unlock my phone?

    Thanks in advance.

      Pramod10 years, 1 month ago

      Well you need to downgrade even further down to iOS 4.2.1 if you want an untethered JB. Even 4.3.1 had an untethered JB, but since you do not have the SHSH blob saved for that device that’s out of the question itself & unfortunately, 4.3 does not have an untethered JB. So, iOS 4.2.1 is what you need.

    salracing10 years, 6 months ago

    did everything by the book to unlock iPhone 3Gs but does not find carrier, it only says searching … Please help! … (IOS 4.3 baseband 06.15)

      salracing10 years, 6 months ago

      After a while it says NO SERVICE (cannot find carrier) …

    eliby10 years, 6 months ago

    Ultrasn0w Fixer isn’t working.
    i have a 3GS with 06.15.00 and i did not get to unlock my device.

      Wolverine10 years, 6 months ago

      I have tested it on my iPhone 3GS on iOS 4.3. Working fine for me.

        Eliby10 years, 6 months ago

        After a while it says NO SERVICE (cannot find carrier) …
        I have the new Bootrom. can it be the reason?

          Wolverine10 years, 6 months ago

          Have you got SHSH blobs saved for iOS 4.2.1? If yes the use this guide to downgrade back and use Ultrasn0w to unlock. As this is still a fixed version of Ultrasn0w, so you might experience some issues.

    Godfred10 years, 6 months ago

    i guess this is tethered is it?

      Wolverine10 years, 6 months ago

      Except iPhone 3GS (Old Bootrom), it is tethered for all iDevices!

    iChebbi10 years, 6 months ago

    The source you added in this post i think it’s already available in Cydia

    sukhbira10 years, 6 months ago

    hey thanx jaxov… now i will update my firmware.