iOS 9.3 (build 13E237) is an official Apple over-the-air update for the iPhone 5s (Global), released on 2016-03-28T16:52:50Z. The update package is 1.04 GB. This is a delta (partial) update that requires 8.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c1b87c88c4fe7d88eba9e6000d3f4d8b5389d35a.zip.