iOS 12.1.2 (build 16C101) is an official Apple over-the-air update for the iPhone 6s+, released on 2018-12-17T21:07:12Z. The update package is 408.42 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: 202f45309d1584a3b0ff91f4881855ed2d583ddc.zip.