iOS 12.1.2 (build 16C101) is an official Apple over-the-air update for the iPhone 6+, released on 2018-12-17T21:06:45Z. The update package is 407.59 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: cae470b1b15de87d4f24d937f6c22ef7fa870001.zip.