iOS 12.1.3 (build 16D40) is an official Apple over-the-air update for the iPhone XS, released on 2019-01-22T18:15:00Z. The update package is 497.11 MB. This is a delta (partial) update that requires 12.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 8b3f5c5a6bfbda63feddadfa5363538c9ac705e9.zip.