iOS 12.1 (build 16B5084a) is an official Apple over-the-air update for the iPhone 6, released on 2018-10-15T17:03:31Z. The update package is 170.68 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: afdb355cf9f52fd3890169dd90ea272c3c9aad38.zip.