iOS 12.1 (build 16B5077c) is an official Apple over-the-air update for the iPhone 6+, released on 2018-10-09T17:05:57Z. The update package is 459.08 MB. This is a delta (partial) update that requires 12.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5a0125656793b7aaf52ee1b0d950c60eadbda222.zip.