iOS 13.3.1 (build 17D5050a) is an official Apple over-the-air update for the iPhone XR, released on 2020-01-22T18:07:24Z. The update package is 249.97 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: 81f2788ef74eb87270820cf5b5d7f9c2d0699b38.zip.