iOS 12.1.1 (build 16C5036c) is an official Apple over-the-air update for the iPhone 6s, released on 2018-10-31T17:04:02Z. The update package is 298.41 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: ddc74f779127bcae9f559b6df7da1e9c3dba6b4a.zip.