Ultrasn0w 1.2.8 version for the latest firmware
A lot of users still own older devices, like iPhone 3GS and iPhone 4, that support the latest iOS version. If your unlocking state still depends on Ultrasn0w application, you will definitely find these news very exciting. iPhones with preserved basebands that were supported by Ultrasn0w application could not be unlocked if they were upgraded to 6.1 iOS version, because Ultrasn0w was not compatible with this iOS version. Now the iPhone Dev Team have finally upgrade their unlocking application and Ultrasn0w 1.2.8 version has been released. You will be able to download Ultrasn0w 1.2.8 and unlock your device on iOS 6.1 version.
What is Ultrasn0w 1.2.8 application?
The iPhone Dev Team have developed a software that could unlock your device, but not all iPhone models are supported. They managed to create a method that would unlock your device, but this method is depending on the iOS and baseband version of your device. Apple wanted to end this unlocking procedure, so every time a news iOS version was released, a new baseband released as well. This way Apple wanted to prevent the users from unlocking their iPhones, because there were adding extra security. Ultrasn0w has many versions, because each version was compatible with a certain iOS version. Ultrasn0w 1.2.8 supports iPhone 3GS and iPhone 4 that have 6.1 iOS version, but it still supports the same basebands.
What basebands Ultrasn0w 1.2.8 supports?
From the first version until the most recent one, the Ultrasn0w 1.2.8 version, only certain basebands are supported. You will be able to unlock the following basebands for iPhone 3GS:
And for iPhone 4 only 01.59.00.
If you are wondering how to stay in a certain baseband version even if you are upgrading your firmaware, then you should know that there is a method for it. If you do not have any of those baseband versions you will not be able to downgrade your current baseband version in one of those. This is only possible to happen if you interfere to the hardware of your device, but this action requires an expert!