iOS 11.4 (build 15F5079a) is an official Apple over-the-air update for the iPhone X (GSM), released on 2018-05-17T17:02:25Z. The update package is 54.14 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: d7c29490eefc6f43b13acf287c1a82910912588c.zip.