iOS 11.4 (build 15F5049c) is an official Apple over-the-air update for the iPhone X (Global), released on 2018-04-16T17:08:06Z. The update package is 292.12 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: d2102084bc0fba5222741e8f13a289aa50203908.zip.