iOS 11.3 (build 15E5178f) is an official Apple over-the-air update for the iPhone X (Global), released on 2018-02-06T18:21:24Z. The update package is 332 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: 988e5a39e5ed7a37aff8dfac30ad2be0083346b2.zip.