iOS 12.1 (build 16B5077c) is an official Apple over-the-air update for the iPhone 6s+, released on 2018-10-09T17:06:00Z. The update package is 459.93 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: bdc289465e73e440b3b4d776d3db352a79d56d49.zip.