iOS 12.1 (build 16B5084a) is an official Apple over-the-air update for the iPhone 6s, released on 2018-10-15T17:03:32Z. The update package is 171.51 MB. This is a delta (partial) update that requires 12.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: da815d0938627a6da1bf4f060b46a1604fa4e1fb.zip.