iOS 10.3 (build 14E5273a) is an official Apple over-the-air update for the iPhone 6s, released on 2017-03-13T17:02:08Z. The update package is 417.4 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: 109d6f9cd174449c63bc7361321e0a9d062dc90c.zip.