iOS 11.2.2 (build 15C202) is an official Apple over-the-air update for the iPhone 6s+, released on 2018-01-08T18:18:38Z. The update package is 513.92 MB. This is a delta (partial) update that requires 11.0.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 47163be16a4bbf899ca567389d25237388602c1e.zip.