iOS 11.1 (build 15B5078e) is an official Apple over-the-air update for the iPhone 6s, released on 2017-10-09T17:02:23Z. The update package is 124.12 MB. This is a delta (partial) update that requires 11.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 1db31b1a70f35c409b6f7c9e7d0826b7665959f8.zip.