iOS 12.1.1 (build 16C5036c) is an official Apple over-the-air update for the iPhone XS Max, released on 2018-10-31T17:03:58Z. The update package is 376.99 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: 4ee7702daf305fe1822299e172a9fc1cd29d67c7.zip.