iOS 10.3 (build 14E5269a) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2017-03-08T17:59:47Z. The update package is 401.09 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: 4a2920a8de4bc19b479843eec6310743f5be2276.zip.