iOS 11.1 (build 15B93) is an official Apple over-the-air update for the iPhone 6s, released on 2017-10-23T17:07:40Z. The update package is 1.16 GB. This is a delta (partial) update that requires 10.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 80cfb4b97f8fbdebccb527f7984f29f7c2bde356.zip.