iOS 11.4 (build 15F5061e) is an official Apple over-the-air update for the iPhone X (GSM), released on 2018-05-01T17:06:22Z. The update package is 287.07 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: c6d4facf6d67343aa32ad4784321ffc2db02c2f3.zip.