iOS 11.1.1 (build 15B150) is an official Apple over-the-air update for the iPhone 6s, released on 2017-11-09T18:10:54Z. The update package is 235.55 MB. This is a delta (partial) update that requires 11.0.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 3a641365864f1047a9fa8550c2c2ee367b2b1739.zip.