Can I install iOS 17 on iPhone X?

The iPhone X originally shipped with iOS 11.0.1. You can update it to the latest release of iOS 16 (currently 16.7.10), but you cannot update it to iOS 17 or higher. iOS 16 is the end of the line.

If your requirements call for iOS 17 (or iOS 18), then you cannot use the iPhone X.

You will need an iPhone XR or higher model.

Your iPhone X has reached the end of its software updates support for the latest iOS operating system, and cannot be updated past iOS 16.7.10.