iOS 12.1.3 (build 16D5039a) is an official Apple over-the-air update for the iPhone XR, released on 2019-01-10T18:09:04Z. The update package is 99.51 MB. This is a delta (partial) update that requires 12.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4e2115282fbcbaa4c39cc66793110564ec6e210e.zip.