iOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPhone 6+, released on 2018-12-05T18:10:34Z. The update package is 1.4 GB. This is a delta (partial) update that requires 11.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 658316c3a8893f8374a20d442fe3f913e455fd6d.zip.