Update new version iphone7plus

The latest update for the iPhone 7 Plus is iOS 15.8.3

Check Settings > General > Software Update to see if this is available on your phone.

If you have already installed iOS 15.8.3, you are up to date and that is as far as the iPhone 7 Plus can go.

The iPhone 7 Plus cannot run iOS 16 or iOS 17, if that might really be what you are asking.

An iPhone 6s, iPhone 6s Plus, iPhone 7, iPhone 7 Plus, or iPhone SE 1 isn't capable of 16 or above; they require an A11 or better CPU. To install 15.8.3, use a computer or the Software Update function in Settings.

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