how can i update iphone 7plus to ios 16

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.

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Diddlydee62 wrote:

How can I update iPhone 7plus to iOS 16

Unfortunately, you can not, as it is not compatible with iOS 16 or higher.