iOS 12.1.1 (build 16C5043b) is an official Apple over-the-air update for the iPhone XS Max, released on 2018-11-07T21:08:59Z. The update package is 380.41 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: df119b141f14b3517291b14d46f8914862579289.zip.