iOS 9.3 (build 13E5200d) is an official Apple over-the-air update for the iPhone 6s, released on 2016-02-08T17:48:31Z. The update package is 143.37 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: 0c6dcbc2e0cb9dcebe06dfa2b0a8bb372fe13f2e.zip.