iOS 12.1.2 (build 16C101) is an official Apple over-the-air update for the iPhone 6s, released on 2018-12-17T21:06:54Z. The update package is 1.73 GB. This is a delta (partial) update that requires 10.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4f8e63aa03bb08e18c94726f5d4bbe091f5cb7c5.zip.