iOS 9.3 (build 13E233) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2016-03-21T18:56:25Z. The update package is 293.51 MB. This is a delta (partial) update that requires 9.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c0b9a5516cd007333ade30b15be09b0513989540.zip.