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 1.39 GB. This is a delta (partial) update that requires 11.2.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9263692b91d460ad66eb35b783cd38ec712768b3.zip.