iOS 11.1 (build 15B93) is an official Apple over-the-air update for the iPhone 6s, released on 2017-10-23T17:07:38Z. The update package is 1.16 GB. This is a delta (partial) update that requires 10.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 48f0a6b6147e52e2e525328753fc7b5f42b88db7.zip.