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 19.29 MB. This is a delta (partial) update that requires 10.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ae18b4d7bd75feb9fa3a4d694ed0a62470ba371f.zip.