Great news for everyone! Ultrasn0w 1.2.7 has been released by the iPhone Dev Team and can now unlock iOS 5.1.1 firmware with preserved basebands.

Ultrasn0w Unlock

Now iOS unlockers can use this official Ultrasn0w tool instead of using the ultrasn0w fixer to unlock iPhone 4 / iPhone 3GS on iOS 5.1.1. It can be used on any firmware as it is backward compatible.

Ultrasn0w 1.2.7 Compatible Basebands

  • iPhone 4 baseband 01.59.00
  • iPhone 3GS basebands 04.26.08, 05.11.07, 05.12.01, 05.13.04 and 06.15.00.

Users can use Sn0wBreeze if on any of these basebands and can preserve while updating to the latest 5.1.1. The Ultrasn0w 1.2.7 won’t unlock iPhone 4 baseband 4.11.08 / 4.12.01 — for more info with regards to unlocking these basebands click here.

How to Unlock iOS 5.1.1 with Ultrasn0w 1.2.7 [Guide]:

Step 1: Use absinthe, redsn0w, Pwnage or Ssn0wbreeze to jailbreak your device on iOS 5.1.1.

Step 2: Open Cydia from the homescreen.

Step 3: Choose Manage tab at the bottom of the screen and select sources.

Step 4: Choose Edit and select Add. Now enter the following repo:
Now select Add source. Click on Return to Cydia after it has added the source.

Download Ultrasn0w 1.2.7 to unlock iPhone 4 / 3gs
Ultrasn0w 1.2.7 add repo

Step 5: After installation is complete, find ultrasn0w in Cydia and install it.

Unlock iPhone 4
install ultrasn0w 1.2.7 from cydia

Step 6: The jailbroken iPhone will unlock automatically.

Step 7: In the end, reboot the iPhone with “slide to power off” swipe. Disable 3G mode in Settings > General > Network if you’re a T-Mobile user in USA.

Congrats! Now your iPhone 4 / iPhone 3gs should be unlocked. You can switch between operators as your desire.

On a side note, iPhone 4S iOS 5.1.1 baseband 2.0.12 ( GSM and CDMA versions) can also be unlocked with Gevey Ultra S and R-SIM III Ultra S — for more info visit this page.

Don’t hesitate to ask any questions!

  • Sam John

    Is 4.10.1 unlock by ultra snow

  • keli619

    does this unlock baseband 4.12.01

  • Philip

    Why do they keep releasing the same crap that unlocks a bb older than my grandma? I think that dev-team are being paid by apple not to unlock the new bb

  • joe

    why is it so difficult to unlock bb 4.11.08 ???

  • Michael Koeppel

    And what is with Base Band 04.12.01? or 04.11.08? PLEASE!!!

  • uX9

    YEah! thats true dev-team not to release unlock baseband anymore, dont become idiot for waiting for new ultrasn0w unlock bb.

  • John f

    I bet if we boycot apple they will change there tune!!!!

  • 泉川 レイモンド

    Is this really works?

  • vida

    They’re work for Apple now, don’t buy any Apple product ,now out there alot of phone work the same with Apple 9/10 bye bye Apple

  • Lakala

    I followed all the steps correctly but now my 3GS keep searching for signals!
    Its on 06.15.00 & 5.1.1
    Some one pls help me

  • Avi Beeps

    I had this same problem same OS and BB. What you need to do is to downgrade your baseband using redsnow and it would work perfectly afterwards. Should bring you to the 05.13.04 BB

  • akash

    i had an iphone 4s locked to canadian bell network i use sam and followed all the steps correctly but when i restarted the phone a screen appeared which displayed iphone on it and asked for activation now i can’t use my iphone please help…

  • venkat

    How to know the phone is unlocked or not?

  • saba10

    hi …i have recently unlocked my iphone 3gs, ios 4.1 and baseband 06.15.00…. how to upgrade ios with the latest version ??

  • taimy

    my 3gs 6.1.2 baseband 6.15 still shows no service..

  • moe saines

    any luck with 04.12.05

  • Paul

    Could do with some help please with unlocking iPhone 4 on bandwidth 4.12.05 running on 6.1.3 I have jailbroke my phone now have cydia and have installed ultrasn0w plus the ultrasn0w fixer 6.1 but still no joy with upswing a different sim server I just get no signel I have changed the setting in the mobile dater for the server that I will be useing but still no luck just get no service I dose not say inactive sim any more but still can not use due no service so can’t activate sim? Dose anyone have a good idea what to do? Any help will be great 🙂

  • Gaurav Shrestha

    I installed ios 5.1.1 and downgraded baseband from 6.15.00 to 5.13.04 using redsnow 0.9.15 b3 and followed all the step you descired but m still getting the no service problem, please help

  • game

    Jailbroke my iPhone 3Gs , RedSn0w’d it to BaseBand 05.13.04 still -at- 6.1.3 Firmware

    installed UltraSn0w + Fixer, nothing

    Reinstalled Mobile Subtrate + UltraSn0w …. Nothing…

    reboot and removed Fixer and Reinstalled UltraSn0w…..Nothing

    Please help?

  • jatin

    i have iphone 4s and it is locked on verizon network in nz but iam in india and want to unlock it plz help

  • alkan

    my iphone4 is not free im 012958006405992