iOS 12.1.3 (build 16D5039a) is an official Apple over-the-air update for the iPhone X (Global), released on 2019-01-10T18:08:55Z. The update package is 298.5 MB. This is a delta (partial) update that requires 12.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9b032d3b2bf34c6f3fba64aab27619acad93e6af.zip.