iOS 10.3 (build 14E277) is an official Apple over-the-air update for the iPhone SE, released on 2017-03-27T16:58:20Z. The update package is 576.2 MB. This is a delta (partial) update that requires 10.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 6122a957cbda479f8e9cfc907d4c18a6498d7f59.zip.