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It is beta version, so please proceed at your own risk!
Ensure that you have made a backup of your iOS device to iCloud or iTunes before you start upgrading to iOS 9 beta.
iOS 9 beta is compatible with the following iOS devices:
– iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPhone 6, iPhone 6 Plus
– iPad 2, iPad 3, iPad 4, iPad Air, iPad Air 2
– iPad mini, iPad mini 2, iPad mini 3
– iPod touch (fifth generation)