How can I update my iPhone 7

An iPhone 6s, 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 15.7.5, use a computer or the Software Update function in Settings.

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Ib230 Said:

"How can I update my iPhone 7"

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Updating an iPhone 7:

Update Using a Computer:

Have a Computer Handy? If so, try using a computer to update. Go here: Update your iPhone Using a Computer - User Tip. If any updates are availabe, they will install, sure enough.