How to upgrade my phone to iOS 17.0

iPhone 8 Plus cannot update to to iOS 17.

You need an iPhone XR, XS or higher if you want to run iOS 17.

An iPhone 8 or iPhone X isn't capable of 17 or above; they require an A12 or better CPU.

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if you have an iPhone 8 Plus, you can't. To upgrade to iOS 17, you need one of the phones in this list.

iPhone models compatible with iOS 17 - Apple Support