iOS 10.3.1 (build 14E304) is an official Apple over-the-air update for the iPhone 5s (Global), released on 2017-04-03T17:00:30Z. The update package is 572.47 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: 9d504914923b9288abb7d8e20187738b213fd4b9.zip.