First Generation iPads can use iOS 5
- but iOS 6 / 7 / 8 need an iPad 2 or newer and are
not compatibel with first gen. iPhone
-updates can be made in
iTunes connected to a computer or under settings - general - software update
Upgrade iOS from within iOS device
(valid for iOS 5 and above)
Since iOS 5, it is possible to upgrade the iOS version without the need to connect the iOS device to a computer (over-the-air update). To upgrade to iOS 6/7/8, simply navigate to Settings > General > Software Update. The screenshot below demonstrates how to do so on an iPad, but this is also valid for the iPhone and iPod Touch.
in iTunes:
How to update to iOS 7
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