iOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPhone XS Max, released on 2018-10-30T17:16:18Z. 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: 8414352aba94f9d97059f4fb0a72bd09a349c8aa.zip.