iOS 11.4 (build 15F5049c) is an official Apple over-the-air update for the iPhone X (Global), released on 2018-04-16T17:08:07Z. The update package is 291.61 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: 2a7c9d88bf28babc6c18b47fb580d9b8592b3567.zip.