iOS 12.1.1 (build 16C5043b) is an official Apple over-the-air update for the iPhone 6s+, released on 2018-11-07T21:09:08Z. The update package is 301.39 MB. This is a delta (partial) update that requires 12.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f33966c9bcafac09088b0bc932004b2f3084d83b.zip.