iOS 11.4 (build 15F5077a) is an official Apple over-the-air update for the iPhone X (Global), released on 2018-05-14T17:17:11Z. The update package is 299.73 MB. This is a delta (partial) update that requires 11.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ff68e1629aa8918c4ad36e2a3dbea3bd190c8ade.zip.