How To Update iPhone to iOS 6 Preserving Old Baseband
Note: The tutorial guide below is appropriate for Windows and Mac OS and you can use it not only to upgrade to iOS 6 but to any other iOS firmware. Step 1. To begin with you need to download two essential software for successful upgrade: Step 2. Unzip Redsn0w and open it. Note: Run as Administrator on Windows and open it by holding down control button click Redsn0w app and then click Open on Mountain Lion (Mac OS X). Step 3. After you launch Redsn0w click Extras => Even More => Restore. Step 4. In this Window click IPSW button and choose iOS 6 firmware you have downloaded in step 1.
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