iOS 9.3 (build 13E5214d) is an official Apple over-the-air update for the iPhone 6s, released on 2016-02-22T17:47:45Z. The update package is 163.3 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: 7b3a9d3d639a0f634c547d3ae6d1932d0971b172.zip.