UltraSn0w has been updated to unlock 5.1.1 on old baseband. Follow the tutorial below to jailbreak and install UltraSn0w unlock on your iPhone 4 . This release doesn’t unlock any news base band . Ultrasnow 1.2.7 only adds support for 5.1.1 firmware to support unlocking on preserved basebands .
Steps to Unlock iPhone 4 5.1.1 using UltraSn0w :
- First jailbreak your iPhone 4 using preserved baseband . Use Snowbreeze , Redsnow or PwnageTool
- Install Cydia and search Ultrasn0w . The version should be 1.2.7 to support unlocking on 5.1.1 firmware
- Install it and reboot your phone . You should now see signal bars appear on your iPhone 4 status bar. Congratulations , your iPhone 4 is now Ultrasn0w unlocked .
More Ways to Unlock iPhone 4 :
iPhone 4 can be unlocked on 5.1.1 firmware using
About Ultrasn0w ver. 1.2.7 Unlock 5.1.1 :
Ultrasnow was first released to unlock iPhone 4 01.59.00 baseband only . It is a software based unlock and requires jailbreaking . Ultrasnow is available for Free download on Cydia that makes your factory locked phone usable with any micro sim card or any carrier you like , worldwide . It lifts all carrier restrictions on your phone . You can use ultrasnow unlock on your iPhone 4 as long as you can preserve the baseband while upgrading the firmware . This is only possible by using a custom ipsw while upgrade . Using a stock firmware will update your baseband and there is no way to downgrade or unlock that firmware using Ultrasnow . Unlockers use PwnageTool (for Mac) and Snowbreeze (for Windows) to create custom firmware that hold the original baseband . The process of creating custom firmware is simple . Just use the application and select the .ipsw firmware file e.g. 5.1.1 , 5.0.1 etc If you are not eligible for Ultrasnow unlock , try other conventional methods like SAM unlock and Gevey Sim .