How can I update my iPhone X

An iPhone 8, iPhone 8 Plus, or iPhone X isn't capable of 17 or above; they require an A12 or better CPU. To install 16.7.8, use a computer or the Software Update function in Settings.

(254201)

iOS 16 was the last update available for the iPhone X. The iPhone X cannot install iOS 17, if that might be what you are asking about.

iPhone X stopped getting updates after 2023. Apple cut software support