iOS 11.4 (build 15F5049c) is an official Apple over-the-air update for the iPhone X (Global), released on 2018-04-16T17:08:08Z. The update package is 237.02 MB. This is a delta (partial) update that requires 11.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 235d623258785843892f59eefea93ac01f0706ba.zip.