iOS 12.1.1 (build 16C5043b) is an official Apple over-the-air update for the iPhone 6s, released on 2018-11-07T21:09:07Z. The update package is 261.07 MB. This is a delta (partial) update that requires 12.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 77eae9c84464b86b81df97cda74e21d70b384582.zip.