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 744.24 MB. This is a delta (partial) update that requires 10.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 487b9303a6f99eea4a001cacf5ad4fa685a8f563.zip.