iOS 12.1.3 (build 16D5037a) is an official Apple over-the-air update for the iPhone X (Global), released on 2019-01-07T18:07:07Z. The update package is 92.49 MB. This is a delta (partial) update that requires 12.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ec1a090cb387c02689e781c31ab78d095b4acbdc.zip.