Typically, getting an iOS device to update is as easy as plugging it into your computer and hitting the Update button in iTunes—or even easier if you have an iOS 5 device, as you can handle the update directly from the Settings app. But what if you need to downgrade your OS, or install an Update image that iTunes can’t retrieve from the server—such as the just released iOS 6 beta? Doing so is easy. Simply connect your device to your…
