iOS 9.3 (build 13E5225a) is an official Apple over-the-air update for the iPhone 6s, released on 2016-03-01T18:13:49Z. The update package is 158.58 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: 9a03377fa7b0548579ac99dac12583a2d096973b.zip.