iOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPhone XR, released on 2018-12-05T18:10:14Z. The update package is 473.72 MB. This is a delta (partial) update that requires 12.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e382cb182b475110952117b85bada0eff4842ebe.zip.