iOS 12.1 (build 16B5068i) is an official Apple over-the-air update for the iPhone 6s, released on 2018-10-02T17:12:04Z. The update package is 291.8 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: b9ca80d92ab89ed8152435d1d5b988dc260e0f6f.zip.