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iOS 11 is compatible with these devices - Apple Support
About iOS 11 Updates - Apple Support
ipad 4th Gen highest ios version upgrade - Apple Community
Can I update an ipad 4 to ios 11 - Apple Community
iOS version by device — iOS Ref
How to update my ipad4 to IOS 11 version - Apple Support …
iOS 11 - Wikipedia
How to Download and Install iOS 11 on an iPad - Laptop Mag
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List of iOS 11 Compatible iPhone, iPad, and iPod Touch Models