iOS 10.3 (build 14E5269a) is an official Apple over-the-air update for the iPhone 6s, released on 2017-03-08T17:59:50Z. The update package is 412.95 MB. This is a delta (partial) update that requires 10.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 2c9c805f2e5b588049746d6a191eb98983e78427.zip.