iOS 11.1.2 (build 15B202) is an official Apple over-the-air update for the iPhone 6s+, released on 2017-11-16T21:22:11Z. The update package is 1.28 GB. This is a delta (partial) update that requires 10.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b42baf0d43016235a794ebd418d0162837861f4f.zip.