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 299.42 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: d7c548b2ab12df20a287acb69b0d32faa7370e2c.zip.