iOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPhone 6, released on 2018-10-30T17:16:54Z. The update package is 1.28 GB. This is a delta (partial) update that requires 11.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 13406f5fdf6938d3eabd33ed2dab1cfe5f8a285a.zip.