iOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPhone XS Max (China), released on 2018-10-30T17:16:16Z. The update package is 466.37 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: 23660fedf05b8f82ed8a389931738d67b34e0fc0.zip.