Although Apple fans are glad with the release of iPad 3 as well as an upgraded iOS 5 along with Apple TV unit, there is this issue now of unlocking or jailbreaking their iDevices. The issue here is that the iOS 5.1 version has resulted in the baseband update so that even the Ultrasn0w unlock tool won’t work on it. So what the Dev-Team members have suggested to the users is that if they need to update to iOS 5.1 version, they’d rather do it through a custom built IPSW. Meanwhile the Team members are working on updating Ultrasn0w pretty soon to be able to work efficiently over the new iOS version facilitating merely the unlocking the devices and basebands that are being currently supported which are:
zmaster, a developer has brought out a tool by the name ‘Ultrasn0w Fixer’ which enables fixing of Ultrasn0w and learning how to unlock iOS 5.1 on iPhone 3GS using Ultrasn0w Fixer. First of all the Fixer package is installed and then you may install the current Ultrasn0w version to get you to unlock your device.
Install the Ultrasn0w fixer package through the following steps and learn how to unlock iOS 5.1 on iPhone 4 using Ultrasn0w Fixer:
Get started with Cydia and click on the ‘Manage‘ tab in the tool bar at the bottom. Then go to ‘Sources’ from the resultant list and click on it.
Click on the ‘Edit‘ option in the top right hand corner of the screen and then select the ‘Add‘ button on the left hand side of the tool bar.
Type in the repository URL, ‘http://repo.iparelhos.com’ in the pop up alert and then click on ‘Add Source‘.
Refresh the repository and get over with the loading of sources, then click on the repo name in the sources list. The Ultrasn0w Fixer utility will be displayed.
Click on ‘Install’ in the top right hand corner and select the Fixer utility. Now confirm the installation and then wait till the process is over.
Your fixer package is installed. Now you need to install the current Ultrasn0w 1.2.5 software. For that you need to select the ‘Search’ option from the bottom of Cydia, typing in ‘Ultrasn0w‘and then clicking on the ‘Search‘ button.
As soon as the Ultrasn0w tool appears, select it from the table and then select ‘Install’ as you did in step 5. You have your installation confirmed and processed. Now you may unlock the device provided it stands up to the hardware and baseband requirements.
So this way you can successfully unlock your device using Ultrasn0w Fixer.