iOS 10.3.1 (build 14E304) is an official Apple over-the-air update for the iPhone SE, released on 2017-04-03T17:00:39Z. The update package is 576.54 MB. This is a delta (partial) update that requires 10.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 7f7defef404c979ee019cb21952e6dd04e44f743.zip.