iOS 12.1 (build 16B5077c) is an official Apple over-the-air update for the iPhone 6, released on 2018-10-09T17:05:58Z. The update package is 273.5 MB. This is a delta (partial) update that requires 12.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ae38edb2f211659c1bd1edcfc91e721b7464d039.zip.