How do I update my iPhone X from iOS 16 to iOS 18?

We will try to keep thins very simple.

The iPhone X can only update to iOS 16. It is an old version of the iPhone.

It is not possible to update the iPhone X to iOS 18.

You need a new phone if you want to update to iOS 18.

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

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CPU = Central Processing Unit. All iPhones (and all computers) have them.

A12 = a specific generation of CPU. Purchase a new(er) iPhone to get a later model than your current iPhone offers. The iPhone X was released by Apple eight years ago.

CPU is an acronym meaning Central Processing Unit. Your iPhone X has an Apple A11 Bionic CPU. RAM is an acronym standing for a particular kind of memory. Your iPhone X has 3 GB of it.

You cannot upgrade the CPU or RAM in an iPhone. To get a more powerful CPU or more RAM, you must purchase an iPhone that already has a more powerful CPU and:or more RAM.