iOS 13.3.1 (build 17D5044a) is an official Apple over-the-air update for the iPhone XR, released on 2020-01-14T18:21:06Z. The update package is 249.48 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: 5e56e9a4ecfad17f90222890825fcf932cf1c677.zip.