iOS 11.1.1 (build 15B150) is an official Apple over-the-air update for the iPhone 6+, released on 2017-11-09T18:10:20Z. The update package is 241.64 MB. This is a delta (partial) update that requires 11.0.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5f248429db15b2d732a5a92e03e3bd622dd6cb9e.zip.