iOS 11.4 (build 15F79) is an official Apple over-the-air update for the iPhone X (GSM), released on 2018-05-29T17:15:49Z. The update package is 788.97 MB. This is a delta (partial) update that requires 11.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 054f891561d63b7d46a73a45c9cc387633ca6daa.zip.