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 1.2 GB. This is a delta (partial) update that requires 10.3.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 90c47aacc132dfe248daad10704b8a626bfc315e.zip.