iOS 13.3.1 (build 17D5026c) is an official Apple over-the-air update for the iPhone XR, released on 2019-12-17T18:13:28Z. The update package is 249.49 MB. This is a delta (partial) update that requires 13.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 025a1b747fd7d5c6710ba7d468f455a2bb422bfb.zip.