iOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPhone X (GSM), released on 2018-12-05T18:10:09Z. The update package is 1.6 GB. This is a delta (partial) update that requires 11.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 793bbd82c3a4e5db815b33d0f723cb3046a046c1.zip.