iOS 13.3.1 (build 17D5044a) is an official Apple over-the-air update for the iPhone SE, released on 2020-01-14T18:21:13Z. The update package is 184.57 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: 9687a613c70d8eda0cb5c59872354d9e78501cdc.zip.