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 359.7 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: fb549ffb951ab2fa315e67dd1f3143d05863c361.zip.