iOS 9.3 (build 13E234) is an official Apple over-the-air update for the iPhone 6s, released on 2016-03-21T18:56:37Z. The update package is 380.48 MB. This is a delta (partial) update that requires 9.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 544670e78d9a400ad319ec14c8a4a8fe5f37d912.zip.