There are three ways  to upgrade iPhone 4 to iOS 5 . All the methods are explained below . Upgrading to iOS 5 required iTunes 10.5 and a good internet connection to download the firmware files . Method 1 : Update via iTunes Automatically . First download iTunes 10.5 on your computer (MAC – PC) […]

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  1. Upgrade to iOS 5 on iPhone 4 and Preserve Baseband – Mac Users
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  3. Upgrade to iOS 4.3 Preserving Baseband


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