iOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPhone XS Max (China), released on 2018-12-05T18:10:12Z. The update package is 499.46 MB. This is a delta (partial) update that requires 12.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 6da4d449323658864e09c908d0d1cf2925aca643.zip.