how to upgrade to 4.3.3to upfrade iso 5 iphone 4how do i upgrade firmware without losing my baseband on window?what is preserving bandbasehow to upgrate an iphone4 to ios 4.3.?Part One: Building and Installing Custom i OS 6.1 Firmware (Baseband Preserved) The first part involves the building and installing custom i OS 6.1 firmware.
how to unlock iphone 3gs that has been jailbroken using sn0wbreeze with ios 6.1.2 and baseband How to upgrade my i4 Baseband without upgrading the ios? If you didn't do when you update to 4.1, this process cannot downgrade your baseband from to . I tried this on one of my i Phone 3G, and it failed, the baseband was updated! I assume the same will happen on a 3GS although I haven't tested it yet. This will only keep the baseband when UPDATING to 4.1. Now it will ask you whether you want to hacktivate or not. Now wait until sn0wbreeze completes building the custom i OS 6.1 for you. Now inside Cydia folder create an Auto Install folder. Turn off 3G and cell data (you can turn these on later). You will see No Service (in i OS 4.x, you will see one signal bar).