iOS 12.1 (build 16B5084a) is an official Apple over-the-air update for the iPhone 6s, released on 2018-10-15T17:03:31Z. The update package is 445.76 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: 9044dce1346dc6a672c62f31c175b0590c6c284f.zip.