iOS 11.4 (build 15F5037c) is an official Apple over-the-air update for the iPhone X (Global), released on 2018-04-02T17:06:49Z. The update package is 287.65 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: 4e70f1198a94a88e0470819dcfdb5f17c2755597.zip.