Help me update my iPhone 8 Plus to iOS 17

Sorry, but it is not possible to update the iPhone 8 to IOS 17 (or iOS 18).

Why? The iPhone 8 does not have the "horsepower" needed to run iOS 17 and higher versions.

If you want to run iOS 17, you will need an iPhone XR or higher model.

You cannot. The iPhone 8 does not support iOS 17.

You need an iPhone XR or later for that.

click here ➜ iPhone models compatible with iOS 17 - Apple Support