iOS 9.2.1 (build 13D14) is an official Apple over-the-air update for the iPhone 6s+, released on 2016-01-04T17:58:51Z. The update package is 35.25 MB. This is a delta (partial) update that requires 9.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ba8aba35ea4a8413eb38f163b9b92e1a4ceb93ec.zip.