iOS 10.3.1 (build 14E304) is an official Apple over-the-air update for the iPhone 5 (Global), released on 2017-04-03T17:00:27Z. The update package is 513.4 MB. This is a delta (partial) update that requires 10.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 774e7ca25a52dd6ec3acc2b0dbbcc48e1f10122a.zip.