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Unlock iPhone 4/3GS on iOS 4.3.3 Using Ultrasn0w 1.2.3 [How-To Guide]

Posted by Ben on May 6, 2011

iPhone Dev-Team has just released Ultrasn0w 1.2.3 to unlock iPhone 4 and iPhone 3GS on iOS 4.3.3. For those who don't know, Apple introduced a new ASLR security feature in iOS 4.3.x which broke Ultrasn0w 1.2 naively using 0x1000 as the main executable base address. Now that iPhone Dev-Team has fixed Ultrasn0w 1.2 on iOS 4.3.3 by releasing Ultrasn0w 1.2.3, you can use it to unlock your iPhone on iOS 4.3.3 with old baseband.

iOS 4.3.3 Jailbroken & Unlocked

Supported Basebands:

  • 04.26.08
  • 05.11.07
  • 05.12.01
  • 05.13.04
  • 01.59.00
  • 06.15.00
  • 05.14.02 via 06.15.00 » [How-To]
  • 05.15.04 via 06.15.00 » [How-To]
  • 05.16.01 via 06.15.00 » [How-To]
  • 05.16.02 via 06.15.00 » [How-To]

Unsupported Basebands:

  • 05.14.02
  • 05.15.04
  • 05.16.01
  • 05.16.02
  • 02.10.04
  • 03.10.01
  • 04.10.01

Steps to Unlock iPhone 4/3GS on iOS 4.3.3 with Ultrasn0w 1.2.3:

  1. Open Cydia app on your jailbroken iPhone. Wait while it reloads and updates its cache.

    2. Cydia on iOS 4.3.3 (Main)

  2. Tap on the Manage tab at the bottom of Cydia and then tap on Sources section to view your current Cydia repos. If you see repo666.ultrasn0w.com already added in your current sources list, jump to step 4 otherwise continue to the next step.

    3. Cydia on iOS 4.3.3 (Manage)

  3. Tap on the Edit button on the top-right corner followed by a tap on Add button on the top-left corner. When Cydia will prompt you for the repo address, enter http://repo666.ultrasn0w.com as Cydia/APT URL and hit Add Source button.

    4. Ultrasn0w 1.2.3 Repo

  4. Now wait while Cydia updates its sources database. Once done, tap on the Search tab at the bottom of Cydia and type Ultrasn0w in the search field. As other 3rd-party Cydia repos also host Ultrasn0w, so make sure you download it from official Ultrasn0w repo as shown in the screenshot below:

    5. Search Ultrasn0w 1.2.3

  5. Select Ultrasn0w from the search results and tap on Install button on the top-right. The DEB file of Ultrasn0w 1.2.3 is around 14.3 KB in size.

    6. Ultrasn0w 1.2.3

  6. Now wait while Cydia installs Ultrasn0w on your iPhone. Once Ultrasn0w installation gets complete, tap on the Reboot Device button to restart your iPhone.

    7. Ultrasn0w 1.2.3 (Installed)

NOTE: Those iPhone users who do not rely on an unlock but still upgraded to iOS 4.3.3 while preserving their old basebands will get 1-signal-bar on iOS 4.3.3. To fix this signal-bars issue, you MUST install Ultrasn0w 1.2.3 on your iPhone.

UPDATE#1: For some reason, iPhone 3GS users with iPad basebands are still not able to unlock their iPhone on iOS 4.3.3 using Ultrasn0w 1.2.3 :( If anyone have got any fix, please share in the comments section below.



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  • john

    I have jailbreaked and installed the cydia. But when I try to open Utlasn0w nothing shows up. I have iphone4 upgraded to iOS 5.01 with modem firmware 04.11.08

    • http://jaxov.com/ Patrick

      Hi,

      Unfortunately, there is no unlock solution yet for your baseband, not even Redsn0w or Gevey. All we can do now is wait and see if Ultrasn0w or Gevey gets updated.

  • zenug

    Got ultrasn0w form repo66.ultrasn0w.org.. but it didn't unlock, tried tmobile sim and it just kept earching and searching. anyone knows what to do?

  • zenug

    I have iPhone 3gs 4.1 with Ipad BB, jailbroken, but I can't add repo for ultrasn0w.. it gives me an error: Verification Error: The request timed out. Been like that for past 10 hours, my guess the repo is down. Is there is a way to get around it?

  • alexbor

    My 3gs is stuck on apple screet too, can't reboot it. I tried to unlock 4.2.1 with ipad baseband, is there a way to fix it? :(

    • im2f4u

      @alexbor

      Mine got stuck at apple logo, seemed it was tryin to install something but the bloody bar didnt move at all.. nyway later I came to realise that if ur customed iOS is tethered then the phone needs redsn0w or ibooty's latest edition to restart, so basically after successful installation of customed iOS or whenever u need to restart the phone or u run out of battery, u will find ur self stuck at that apple logo......

      Just disconnect the device from computer, wait for 10-15 seconds, connect it back, run redsn0w's latest version, select 'extras', select 'just boot', follow the instructions to reboot the device n phone shud reboot in about 5-10 minutes in jailbroken state :)

      P.S. try avoiding running out of battery or restarting the phone till u have untethered version of ur iOS which doesnt need any assistance in rebooting the device..

    • im2f4u

      disconnect the phone, wait for 10-15 seconds, connect it back, run redsn0w's latest version, select 'extras' then select 'just boot' then follow the instructions n phone shud boot in bout 5 mins :)

      fyi ur customised tethered iOS need redsn0w's help to restart the device

      P.S. try avoiding running out f battery or restarting the phone often till u have untethered version of iOS available to install in device which doesnt need ny external software like redsn0w or ibotty to reboot the device!

  • pdxflier

    I can't reboot my 3GS!!!!! It is stuck on the apple screen. If i try and reboot through redsn0w it gets stuck on the pineapple screen. I tried this jailbreal with 4.3.4 iphone 3gs software instead of the recommended 4.3.3 Could that be the problem?

  • IdanMalka

    hi, ive followd the instructions for fixing the signal bars but still after recovering, jailbreaking, installing ultrasn0w, still no fix is seen.. everything was fine 2 days ago and suddenly reception just.. died

    i have iphone 3gs 4.3.2 with 05.16.02

    plz if u have some kind of solution ill be more than happy to apply

    • http://jaxov.com/ Jacklord

      @IdanMalka Hi,

      Since iOS 4.3.2 comes by default with 05.16.02 baseband for iPhone 3GS users, so there is no need to install Ultrasn0w fixer or any signal bar fixer from Cydia. This signal issue is being faced by those who have preserved their basebands for unlocking purpose. You need to hard-reset your iPhone or just reflash the iOS 4.3.2 if you have saved SHSH blobs.

      Hope that helps!

  • n3oshadow

    4.3.3 iPhone 3gs 6.15.00 baseband and jailbroken with sn0wbreeze ad ultrasn0w 1.2.4 wont work!!! PLEASE HELP

    • http://jaxov.com/ Patrick

      Hi,

      Can you give more details about your problem? What are errors you've experienced?

    • http://jaxov.com/ Jacklord

      @n3oshadow Hi,

      Can you be more specific with your problem? What are the error's that you've experienced?

      • n3oshadow

        @Jacklord um so I jailbreak with sn0wbreeze and have BB 6.15.00. I've never had this problem before. Ultrasn0w installs then i get no signal. I've tried many methods to fix it but none have worked! Its also having the same problem on ios5 i can downgrade to 5.0 or 4.3.3 from 5.0.1 since i have shsh blobs. Also its an iPhone 3gs old bootrom

        • http://jaxov.com/ Jacklord

          @n3oshadow One of your option is to downgrade to iOS 4.3.3 and install latest version of Ultrasn0w. Also make sure to restore custom IPSW (Not stock) since you are on iPad baseband. If Ultrasn0w 1.2.4 do not work, install Ultrasn0w 1.2.3 via DEB file manually.

  • shibs

    hi pramod hope yo doing well......I am using iphone 3gs with ios 4.2.1...recently i changed my network provider and activated 3g also. Now my battery condition is pathetic.....i have tried turning off 3g bt no difference its draining very faster than before...if i turn off cellular data then i will get a battery backup...please help me.....

    • http://jaxov.com/ Patrick

      Hi,

      Try activating your phone with an official carrier SIM. If you do not have it, maybe you can borrow from a friend. It will bar the search for valid certs in iOS 4.1/4.2.1. For more information: http://bit.ly/hh6vyh

      Hope that helps!

  • Help Me!!!

    I'm also have an iphone 3gs(new bootrom) iOS 4.3.3 on iPads baseband but still get no service. I used Snowbreeze and ultrasnow 1.2.4 but still nothing. Any help is appreciated.

  • Help Me!!!

    I'm also using iphone 3gs(new bootrom) iOS 4.3.3 on iPads baseband but i still get no service after unlocking with Sn0wbreeze and Ultrasn0w 1.2.4. Can someone help me out? I would really appreciate it!

    • http://jaxov.com/ Patrick

      Hi,

      Hmm, it could be an issue with your carrier network in your area. Pop in a different SIM from a different carrier and see if the problem persists.

  • Ayub

    Same issue for me i have 4.3.3 Firmware on My 3gs but 1.2.4 Doesnt work for me im trying to use Tmobile Carrier. My 3g is also off please help

    • http://twitter.com/pram0dm Pramod

      What is the version of your device's Modem FW ?

  • Cooolthud

    Worked flawlessly... :) Thanks a lot

  • Yasir

    waw
    same problem
    please let me konw if you fix it

  • Izmir

    Yes im sure its 06.15.00. No,i didnt abble to see any carrier around me. the funny thing is i can copy my contact to my iphone.iphone detect my phone number.and shows me im using Maxis 10.1(malaysia carrier) but it keep shows searching and no service. i've install ultrasnow 1.2.4, install SAM but it still the same. By the way, i active my phone using snowbreeze since i dnt have the original provider sim card.Is is suppose to show me "Your iPhone Activated"? cuz i didnt get any notification like then during my activation.

    • http://twitter.com/pram0dm Pramod

      The activation message doesn't really matter. Have you tried using a different carrier SIM as well? Leave SAM for now.

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