iOS 10.3 (build 14E5249d) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2017-02-20T17:57:54Z. The update package is 272.78 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: 6987f7026e531f8e71b881eda41173eb18b03bc3.zip.