iOS 13.3.1 (build 17D5044a) is an official Apple over-the-air update for the iPhone XS, released on 2020-01-14T18:21:04Z. The update package is 251.67 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: 1816efa28e03b6eb8d0f7203877826720b45b756.zip.