iOS 11.0 (build 15A372) is an official Apple over-the-air update for the iPhone 6s, released on 2017-09-12T19:10:22Z. The update package is 1.1 GB. This is a delta (partial) update that requires 10.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 536c3c10f993a19df5e809bff1f027b4c3db113b.zip.