iOS 9.9.10.3 (build 14E277) is an official Apple over-the-air update for the iPhone 6s, released on 2017-03-27T16:58:11Z. The update package is 1.15 GB. 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: 520aedbed05090730f6633c19ab117c715428940.zip.