iOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPhone 6+, released on 2018-12-05T18:10:30Z. The update package is 1.42 GB. This is a delta (partial) update that requires 11.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: cd3028bb35406bf48a967edaaa0b664457f00a1d.zip.