iOS 10.3 (build 14E5239e) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2017-02-06T18:02:12Z. The update package is 674.37 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: 54c6590afc9bc506547e8e9fd77d08b39aabe418.zip.