iOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPhone 6, released on 2018-12-05T18:10:38Z. The update package is 1.73 GB. This is a delta (partial) update that requires 10.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4e77a0bee37c371668466baa556524914af32113.zip.