Unlock iOS 4.3 With Snowbreeze 2.3b4 & Ultrasnow 1.2 [ iPhone 4, 3GS ]

Cosmin Coman on March 20, 2011 with 17 Comments

A new version of Snowbreeze was released, entitled Snowbreeze 2.3b4, that adds support for Ultrasnow 1.2 to unlock iOS 4.3 on your iPhone 3GS and iPhone 4 . Well, you can unlock iOS 4.3 on devices with old basebands at this time, and I know this is a disappointment for many of you that have iPhone 4 new basebands. If you have iPhone 4 with any of the new basebands stay tuned because we’ll post an unlock iOS 4.3 tutorial as soon as Ultrasnow will be updated.

By following this Snowbreeze 2.3b4 tutorial, you will be able to unlock iOS 4.3 with Ultrasnow on the following device basebands:

01.59.00
04.26.08
05.11.07
05.12.01
05.13.04
06.15.00

If you have the following device basebands, this tutorial won’t help you unlock iOS 4.3, and you’ll need to wait for a new Ultrasnow update.

02.10.04
03.10.01
04.10.01
05.14.02
05.15.04

However, if you own an iPhone 3GS, you can update its baseband to 06.15.00 ( iOS 4.2.1 ) and use Ultrasnow 1.2 to unlock iOS 4.3 on it. Be cautious if you do this, because you may lose your GPS. If you decide to upgrade your iPhone 3GS baseband to 06.15.00 in order to unlock iOS 4.3 you can follow this tutorial and then come back to this guide to proceed with the unlock with ultrasnow 1.2 ( part 2)

Snowbreeze 2.3b4 supports the following devices:

iPhone 3GS, 4
iPad
iPod Touch 3G, 4G

Follow the tutorial below to jailbreak and unlock iOS 4.3 on your iPhone 3GS or iPhone 4 using Snowbreeze 2.3b4 & Ultrasnow 1.2

Part 1: Jailbreaking with Snowbreeze 2.3b4

First you need to jailbreak your iPhone 4 or iPhone 3GS using Snowbreeze 2.3b4. In order to do that you can follow the tutorial posted here, but make sure that you download Snowbreeze 2.3b4 using the link at the end of this guide.

Part 2: Unlock iOS 4.3 with Ultrasnow 1.2

When the jailbreak process is complete, you can proceed with the unlock iOS 4.3. In order to do that, you can follow the tutorial below:

Tap on Cydia
Tap on Manage
Tap on Sources
Tap Edit and then Add. When the window pop’s out enter “http://repo666.ultrasn0w.com” and then tap on Add Source
Wait for Cydia to complete a series of automated steps and then search for Ultrasnow 1.2 and install it.
Restart your iPhone 4 or iPhone 3GS and you’re done!

You have managed to successfully unlock iOS 4.3 on your iPhone 4 or iPhone 3GS.

If you are a Mac user you can also jailbreak your iDevice using PwnageTool, however, you cannot unlock iOS 4.3 yet, because only Snowbreeze 2.3b4 supports Ultrasnow 1.2 at this time.

Download links:

Download Snowbreeze 2.3b4 here

Update: You can now unlock iPhone4, 3GS on 4.3.1

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about the author

Cosmin is a smartphone enthusiast that writes articles for our iPhone and Windows Phone 7 departments and he provides the latest jailbreaks and unlocks releases as well as hot news about Apple or Microsoft. His best friend is his iPhone 4 and he is always comparing smartphones with Adu.

Discussion 17 Comments

Doc Naker March 20, 2011 at 4:31 PM
Thanks for putting the base bands that this works for....Come on 03.10.01
Bani March 21, 2011 at 1:42 AM
hey i have an ipod touch 4g with iOS 4.3 and i downloaded sn0wbreeze 2.3b4 and did everything several times! but i still dont get cydia. like its not there at all!! help please!
- Cosmin Coman March 22, 2011 at 2:55 AM
  Did you have a fresh 4.3 install before you installed the custom firmware? That usually helps avoiding errors and crashes like this one
Paulio March 21, 2011 at 8:04 AM
Why doesnt it work?
- Cosmin Coman March 22, 2011 at 2:54 AM
  Of course it works
Bani March 22, 2011 at 3:28 AM
yes i downloaded 4.3 from itunes and then downloaded it again from the website
rob March 22, 2011 at 9:58 AM
there seems to exists a HUGE bug, that some phones actually are able to jailbreak and unlock, but they don't have 3G network, itunes cannot sync (session cannot be started) and the signal strength is terrible, so something is terrible wrong. i have the same problem and did not come across a solution yet.
Jazmin March 22, 2011 at 10:29 AM
I have iphone 4 with version of 4.2.1 and baseband 03.10.01. I bought in uk and i live in Sweden and i would like 2 unlock it, help me out plz how do i unlock my iphone 4? Thnx
- Cosmin Coman March 26, 2011 at 2:01 AM
  You can't unlock it at this time, sorry
Ganguly March 23, 2011 at 8:03 AM
Hi Cosmin & everyone,I bought an iphone 3gs in US & it was jailbreak with 4.2.1os...but after coming to india unfortunatly I have updated it to 4.3 through iTunes..& stuck in the activation screeen...Today I have tried ur instruction to upgrade it with 4.3 again..but no result...even after booting with ibooty it's showing the same....can u please help me... PLEASE....it's my dream phone...n i made a mes....need ur suggession...
- Cosmin Coman March 26, 2011 at 1:55 AM
  Do you rely on a carrier unlock?
tim March 24, 2011 at 2:59 PM
I have a 3gs 4.3 FIRMWARE 05.16.01 can you please show me how to unlock this? I have try everything that I know of, I hope you will know of something that I having know of. Thank
- Cosmin Coman March 26, 2011 at 1:44 AM
  You cannot unlock that fw at this time, sorry
Aeymon Khan March 25, 2011 at 1:48 PM
i have iphone 3gs with 5.12.1 baseband and 3.1.3 firmwear (new bootrom)....my questions are: 1. Would i be able to jailbreak and unlock ios4.3 using this tutorial... 2. will it be teathered or unteathered? Note: i rely on a carrier unlock... Thanx alot for ur time!
Lars March 25, 2011 at 1:56 PM
Thx for the tutorial. I succefully update my iPhone 4 (4.2.1 with bb 3.10.01). However I thought this would also take care of the activation process (as it's still at&t locked) which it didn't. Sadly I'm still stuck on the "insert valid sim" screen. I tried iBooty 2.2 to see if maybe the an jailbroken boot would take care of the problem but although it seems iBooty could succesfully execute after the phone was put in DFU mode but it didn't boot my phone back up (also the screen didn't flicker as I saw in the tutorial movies). Does anyone has advice?
- Lars March 26, 2011 at 7:03 PM
  I can! (do what exactly?)
Cosmin Coman March 26, 2011 at 2:02 AM
Of course you can