iOS 12.1.1 (build 16C5036c) is an official Apple over-the-air update for the iPhone 6s+, released on 2018-10-31T17:04:03Z. The update package is 300.08 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: f5ffcc456bc5add101298858442faa071c0ec45a.zip.