iOS 12.1.1 (build 16C5050a) is an official Apple over-the-air update for the iPhone XS Max, released on 2018-11-15T18:04:54Z. The update package is 135.35 MB. This is a delta (partial) update that requires 12.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 75c970ef66e9751aeec934484077ce192c74dcf7.zip.