iOS 11.4 (build 15F79) is an official Apple over-the-air update for the iPhone X (GSM), released on 2018-05-29T17:15:51Z. The update package is 684.48 MB. This is a delta (partial) update that requires 11.2.6 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 076eedac9fa7653b6d1615f6a9974fcc95dff654.zip.