iOS Mods

April 10, 2011

Ultrasn0w 1.2.1 Released For 4.3.1 Unlock

Ok so if you have an iphone 4 or 3gs and you have used the ultras0w fixer that we posted about earlier and you are still having signal bar issues heres the ultrasn0w release.

unlock iphone ios4.3.1

Dont get to excited as this is for thos who preserved older basebands who have been experiencing trouble since jailbreaking 4.3.1. Iphone Dev-Team says:

We’ve pushed out the 4.3.1 compatibility fix for ultrasn0w in Cydia — it’s now at version 1.2.1. If you’re not already at 4.3.1 and you need the unlock, please be sure you understand how to get to 4.3.1 using a custom IPSW that doesn’t update your baseband.

This isn’t a new unlock! It’s to allow those who are already unlocked to use FW 4.3.1. It also fixes the signal bar issue for those who aren’t using the unlock but retain an older baseband intentionally.

AFTER INSTALLING ULTRASN0W 1.2.1, PLEASE REBOOT YOUR iPHONE using the normal “slide to power off” swipe. T-Mobile users in the USA also should disable 3G mode in Settings->General->Network.

Supported basebands: (01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00)

Iphone 3gs users must be on baseband 06.15.00 the baseband for 4.1/4.2.1


1. First off you have to jailbreak your device while preserving your Baseband follow guide HERE
2. Next step is to instal UltrasnOw from cydia to do this follow the simple steps below.

– Launch Cydia APP

– Press the manage TAB on bottom Menu

– Now select the Sources Button

ultrasn0w fix

3. Now click Edit at top of screen then ADD. You will now be prompted to add a URL. Add this URL into the box and click add source.

ultrasnow repository link

4. Cydia will now update all your sources for you. When installation is complete click on the Search TAB on bottom of screen and search “ultrasnOw 1.2.1” (NOTE THAT ITS A ZERO IN snOw) and install the application.

unlock iphone ios4.3.1

5. All thats left to do now is reboot your phone and you will be carrier unlocked with no issues.

Sources – Ip

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Ryan Oneill

Editor In Chief

BeginnersTech was an idea I had one Sunday when I was bored. It is now not only a website but a successful YouTube channel that takes me all over the world. Don’t ever let anyone discourage you. Chase those dreams.