How do I update my iPhone 7 software to iOS 17?

If you are asking to update your iPhone 7 to iOS 17, that won’t be possible. Your iPhone 7 no longer receives the latest iOS software update support and cannot be updated past iOS 15.8.3. You will need a newer iPhone to run iOS 17, or ideally the latest iOS 18.

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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Farhanalibrohi wrote:

On update my phone

Not going to happen.

No.