iOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPhone X (Global), released on 2018-12-05T18:09:52Z. The update package is 1.62 GB. This is a delta (partial) update that requires 11.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 76c94884b10b13f341370154fceb3472557e45b2.zip.