iOS 12.1.2 (build 16C101) is an official Apple over-the-air update for the iPhone XR, released on 2018-12-17T21:06:23Z. The update package is 360.24 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: 73220a3154bb3f038219ba9ec4ee8a224f3c554d.zip.