iOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPhone XS Max, released on 2018-12-05T18:10:13Z. The update package is 499.46 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: 0bf836cd9b02b6e448e4f960f1eabfa74182d7d8.zip.