iOS 9.3 (build 13E5191d) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2016-01-25T20:52:45Z. The update package is 103.29 MB. This is a delta (partial) update that requires 9.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 0435c257b6b59e4bea41a22a431fae9199bda62a.zip.