iOS 10.3 (build 14E5260b) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2017-02-27T17:57:02Z. The update package is 380.19 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: 2885094bb4cae9f75447281aea613cb225fc2e6b.zip.