Preserve your baseband and upgrade your firmware!
Preserve your baseband – Why to do it?
Many people will probably wonder why to upgrade your device’s iOS version and not upgrade your baseband. If you managed to jailbreak your device and then perform a software unlock to it, you should know by now that ultrasn0w can unlock only certain baseband versions. If you try to upgrade your iPhone to a newer iOS version, your baseband version will be upgraded too, and this means that you will not be able to unlock it with a software unlock. This is why you should Preserve your baseband if you are planning to upgrade your firmware version!
What to do in order to successfully Preserve your baseband?
Before taking any action you must first verify that the iOS version you want to upgrade to can be jailbroken. This is very important because in order to make a software unlock, your iPhone must first be jailbroken. You must Preserve your baseband because there is not a method to downgrade baseband versions yet, and probably no method will be invented to the near future.
There are a lot of methods that can Preserve your baseband but every method will give you the same results. The team that created the ultrasn0w application that can software unlock your device, is constantly updated in order to support the latest iOS versions.
What software to use to Preserve your baseband?
The most popular softwares that can Preserve your baseband are the Redsn0w, PwnageTool and Sn0wBreeze. With a simple research on the internet you will be able to locate and download them. You must read very carefully the instructions before using any of these applications, because if you do not follow the steps correctly errors may occur or you might not be able to Preserve your baseband and lose your unlocking state!