iOS 11.1.1 (build 15B150) is an official Apple over-the-air update for the iPhone 6, released on 2017-11-09T18:10:34Z. The update package is 1.1 GB. This is a delta (partial) update that requires 10.3.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 636bd16a36a9d2e98cee727f4f60bbb425ad28f9.zip.