Unable to install iOS 17 update on iPhone

If you are trying to update your iPhone X as stated in your tagline to iOS 17, that won't be possible. It can only be updated to iOS 16.7.10. iOS 17 is supported on the iPhone XR or later, and note that all iPhones that support it also are capable of running iOS 18.

Find out why you can't update an iPhone X beyond iOS version 16.x.x in this compatibility list:

Your tag line says that you have an iPhone X.

You cannot update an iPhone X to iOS 17 or higher. iOS 16 is the end of the line.