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How can I download iOS 9 to my iPhone 4 that's connected to a Cromebook?
Re: how can i download ios9 to my iphone 4 thas connected to a cromebook?
Welcome to iMore! iTunes isn't compatible with the operating system in your Chromebook. You'll need to download it to a computer running Windows or OS X.
You should be able to update over the air by going to Settings > General > Software Update.