iOS 12.1.2 (build 16C101) is an official Apple over-the-air update for the iPhone XS Max (China), released on 2018-12-17T21:06:20Z. The update package is 363.95 MB. This is a delta (partial) update that requires 12.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 3016b36da5594a182098061d281a0ac29074412c.zip.