iOS 12.1.2 (build 16C101) is an official Apple over-the-air update for the iPhone XR, released on 2018-12-17T21:06:22Z. The update package is 477.91 MB. This is a delta (partial) update that requires 12.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 38c28275fbaa4b4be850d6aa8ea60017542a2976.zip.