iOS 9.3 (build 13E5191d) is an official Apple over-the-air update for the iPhone 6s, released on 2016-01-25T20:52:49Z. The update package is 132.69 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: a62147098ba8170eb5886a9711fe5c3ee96170f0.zip.