iOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPhone 6+, released on 2018-10-30T17:16:46Z. The update package is 1.39 GB. This is a delta (partial) update that requires 11.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 88ec132ecdb8c560526ad331a3ab06de91e1ba0a.zip.