iOS 11.4 (build 15F5049c) is an official Apple over-the-air update for the iPhone X (GSM), released on 2018-04-16T17:08:13Z. The update package is 291.64 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: 0ab3a837ff8421b46ab47d8111186c5857464725.zip.