iOS 9.3 (build 13E5237) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2016-03-28T16:53:09Z. The update package is 1.35 GB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4024675b8e4568ca5eebf25d3ff448aff55f601b.zip.