iOS 12.1.3 (build 16D40) is an official Apple over-the-air update for the iPhone XR, released on 2019-01-22T18:15:09Z. The update package is 485.97 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: 42d5b6c28993a3cb6760ff7ad879ad1af08a0e44.zip.