How To Unlock iPhone 3GS/4 On iOS 5.1 With Ultrasn0w fixer? [Guide]

A day after the release of iOS 5.1, The iPhone Dev Team has updated
their famous jailbreak tool Redsn0w to version 0.9.10b6 to jailbreak all
the A4 devices [iPhone 3GS/4, iPod Touch 3G/4G, iPad 1] on iOS 5.1.
Now, About the Unlock. If you relying on unlock using Ultrasn0w, you
can use this tweak to unlock your iPhone 3GS/4 on iOS 5.1.


Unlock iPhone 3GS/4 On iOS 5.1

The iPhone Dev Team hasn’t released an updated version of Ultrasn0w to
unlock the iPhone 3GS/4 on iOS 5.1. However, zmaster has released
Ultrasn0w fixer to solve this problem for those relying on unlock using
Ultrasn0w. Ultrasn0w fixer hasn’t been released publicly yet but you
can get it from the developer’s repo.
Supported Basebands:

• 01.59.00
  
• 04.26.08
  
• 05.11.07
  
• 05.13.01
  
• 05.12.01
  
• 06.15.00
  

How To Unlock iPhone 3GS/4 On iOS 5.1 Using Ultrasn0w fixer?

Step #1: Jailbreak your iPhone 3GS/4 Using Redsn0w 0.9.10b6 or Sn0wbreeze 2.9.2.
Step #2: Launch Cydia, Head to Manage > Sources.
Step #3: Hit “Edit”, then “Add” and add the repo below.<blockquote>
Untitled Document
</blockquote>
Step #4: Search for “Ultrasn0w fixer for iOS 5.1” and Hit “Install”.

Step #5: Now, Search for “Ultrasn0w” and install it.
Congrats, you have done it, After installing Ultrasn0w, Reboot your
iPhone and insert the SIM card and it should be working properly.