Unlock iPhone 4, 3GS iOS 4.3 with UltraSn0w after Sn0wbreeze 2.3b Jailbreak - iPhoneHeat

Unlock iPhone 4, 3GS iOS 4.3 with UltraSn0w after Sn0wbreeze 2.3b Jailbreak

Sn0wbreeze 2.3b4 comes with MobileSubstrate and Ultrasn0w unlock fix for iOS 4.3 on iPhone 4 and 3GS. UltraSn0w is currently broken on iOS 4.3 firmware Because of MobileSubstrate issues. However, iH8Sn0w has fixed it for you guys and now UltraSn0w can unlock iPhone 4, 3GS (old basebands) iOS 4.3 after jailbreaking with Sn0wBreeze 2.3b.

Before unlocking iPhone 4, 3Gs on iOS 4.3 please read the important part below.


  • Ultrasn0w works for following basebands: 01.59.00 | 04.26.08 | 05.11.07 | 05.12.01 | 05.13.04 | 06.15.00 (How to check iPhone baseband)
  • Ultrasn0w is NOT compatible with the following basebands: 02.10.04 | 03.10.01 | 04.10.01 | 05.14.02 | 05.15.04
  • Upgrading your iPhone 3GS baseband to the 06.15.00 iPad baseband hack to unlock MAY cause you to lose your GPS! (How to: Update iPhone 3GS to Baseband 06.15.00)
  • Sn0wbreeze 2.3b provides a tether jailbreak solution for iPhone 4, 3GS, iPod Touch 4G, 3G and iPad 1.

Follow the steps below to unlock iPhone 4, 3GS 4.3 with UltraSn0w after Sn0wbreeze 2.3b Jailbreak…

How to Unlock iPhone 4, 3GS 4.3 with UltraSn0w

Step 1

First of all jailbreak your iPhone 4 and 3GS on iOS 4.3 firmware using Sn0wBreeze 2.3b. we have already posted a detailed guide on how to create custom firmware using sn0wbreeze and jailbreak iPhone 4 and 3GS here:

How to: Jailbreak iOS 4.3 with Sn0wBreeze 2.3b

Step 2

Once your iPhone 4 or 3GS is jailbroken, you can now unlock iPhone 4, 3GS iOS 4.3 with UltraSn0w 1.2. To do so:

***T-Mobile USA users please disable 3G network first. (Settings >General >Network and turn the “Enable 3G” switch to OFF.)

  • Open the Cydia.
  • Go to manage Tab at bottom.
  • Hit the big Sources button.

unlock ios 4.3 ultrasn0w (3)

  • Hit the Edit button on Top-Right
  • Then Hit the Add button on Top-Left
  • Then Enter the following URL: http://repo666.ultrasn0w.com and hit the Add Source button.

unlock ios 4.3 ultrasn0w (2)

  • Once the Source is added to the Cydia, hit the big return to Cydia button at bottom of the screen and then Done button.
  • Go to Search tab and search for ultrasn0w and install it.

unlock ios 4.3 ultrasn0w (1)

Installing UltraSn0w will unlock iPhone 3GS baseband 04.26.08, 05.11.07, 05.12.01, 05.13.04, 06.15.00 or iPhone 4 with baseband 01.59.00. Once the installation is completed, respring your iPhone.

Voila! You have unlocked iOS 4.3 on iPhone 4/3GS/with UltraSn0w and can use SIM from any carrier now.

You can follow us on Twitter, Join us at Facebook, and also Subscribed to RSS Feed to receive latest updates.

Also checkout:

26 comments… add one
mackoy5 March 22, 2011, 3:41 am

now we can used the ios 4.3??is this complete fixed unlocked and jailbreaked???

mackoy5 March 22, 2011, 4:03 am

is this complete fixed unlocked and jailbreaked??

alvin cartagena March 22, 2011, 1:03 pm

Sweet jesus..works Perfect to me.

iam from philippines.many thanks to you guise!!

tee March 22, 2011, 8:51 pm

What about 3.10? UGH, MORE WAITING!!!

altecmayank March 22, 2011, 11:23 pm

thank you for the information m8.

nathan 'alias' lee March 23, 2011, 3:10 am

Still have to retain 01.59.00 base band on the iPhone 4 and to jailbreak iOS 4.3.

tafhim March 23, 2011, 5:55 am

im on i4 with 4.3 and 1.59 BB installed ultrasnow and when i put my sim i get only 1 bar for tmobile. any reason why?

magic230 March 25, 2011, 2:29 pm


Bobby March 27, 2011, 7:32 am

Yea the same problem happens to me everytime. What gives?

georges March 23, 2011, 11:19 am

I did the jailbreak with snowbreese it worked fine but now my bb is 05.16.01 Ps my phone is 3gs is there any futur unlock for this bb thx…..

Nina March 23, 2011, 6:25 pm

This will work of jailbreakme?

dudu11 March 27, 2011, 8:42 am

Nina stay away from this junk as you see you don’t get no response wait for IPhone5 comes in US Factory unlock February 2012 Sprint get’s the I phone to, so lot of change it’s coming Be passion

tom March 24, 2011, 10:30 am

Will the Sn0wbreeze 2.3b4 jailbreak works on 3gs bb 05.16.01? Please confirm. Thanks.

Tomm March 24, 2011, 5:06 pm

Guys my iPhone 4 is iOS 4.2 bb 3.10, if I’m goin to update to iOS 4.3 is it ok? Tnx.

noname March 24, 2011, 6:35 pm

Any info on Pawnage Tool or Greenpois0n 4.3 for Windows 7?!

3Gs owner March 24, 2011, 7:00 pm

It doesn’t work for me. Phone trying to detect networks and stuck on “Searching”.

tweeker2 March 26, 2011, 7:04 am

ok so i have tried to understand all this and im not above saying that i need help! trying to jailbreak and unlock my iphone 3gs ios 4.3.1 baseband 05.16.02 can someone PLEASE either tell me in step by step directions or point me to step by step directions to do this????

revs March 29, 2011, 7:42 am

hi. i have an iphone 3gs with ios4.3. im having a hard time unlocking it. my firmware says that it is at 5.16.02.

what should i do? i tried to check the link on how to update to firmware 5.16 but i need to downgrade to 4.2.1?

is there no other way to make it 5.16 in ios4,3?

revs March 29, 2011, 7:43 am

sorry mistyped.. i mean is there any other way for me to change to 6.15 when my ios is 4.3?

iphonegeek March 30, 2011, 4:34 am

No you cannot downgrade your 05.16.01/02 baseband to those unlockable basebands. And you cannot downgrade ios 4.3 to lower if you did not saved your shsh blobs from the earlier versions.

Arian March 24, 2015, 11:47 pm

I love ios4

Leave a Comment