All of us are waiting for Ultrasn0w 1.3 to unlock our idevices on iOS 4.3.1. It’s still in development phase but iH8sn0w and MuscleNerd has fixed the current Ultrasn0w which was not compatible with iOS 4.3.1 to work on iPhone 4 and iPhone 3GS running on iOS 4.3.1. It works perfectly fine but don’t support any new baseband. It’s just a fixer of the current version of ultrasn0w and can unlock the iPhones having the baseband 04.26.08, 05.11.07, 05.12.01, 05.13.04, 06.15.00, and 01.59.00.
It’s not an official release and also have a bug that even if you will have full signals, only one signal bar will appear on the screen. I think it is a not a big issue at all but if you don’t want this bug in your phone then wait for the official release, otherwise follow the guide given below to unlock your iPhone on iOS 4.3.1.
STEP 1: First of all jailbreak your iPhone 4 or iPhone 3GS on iOS 4.3.1 by using any of the guide given below.
- Untetehred jailbreak iPhone by using Redsn0w 0.9.6rc9
- Untetehred jailbreak iPhone by using PwnageTool 4.3
- Untetehred jailbreak iPhone by using Sn0wbreeze 2.5
STEP 2: Run the Cydia and go to Manage -> Source -> Edit -> Add and type the following line and click on “Add Source”.
http://cydia.pushfix.info/
STEP3: After the verification of the source, tap on “Done” button and then on the added source.
STEP 4: Now search for the Ultrasn0w Fixer
STEP 5: Install it and reboot your iPhone4 or iPhone 3GS.
After the rebooting your iPhone will be unlock. Now enjoy any career of your choice 
Keep visiting TechNama for latest unlocking and Jailbreaking tools and guide.
Related Articles:
- How to Unlock iPhone 4 and iPhone 3GS on iOS 4.3.2 Using Ultrasn0w fixer
- How to Unlock iOS 4.0.1 on iPhone 3GS & iPhone 3G with Ultrasn0w 0.93
- Unlock iOS 4.3.1 on iPhone 4 and iPhone 3GS Using Ultrasn0w After Jailbreaking with Sn0wbreeze 2.4 – How to Guide
- How to Unlock iPhone 4 and iPhone 3GS on iOS 4.3.2 [Old & New Bootrom] Using Ultrasn0w 1.2.2
- How to Unlock iPhone 4 and iPhone 3GS on iOS 4.3.1 Using UltraSn0w 1.2.1
- Unlock iPhone 3GS with Ultrasn0w on iOS 4 GM Baseband 04.26.08
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