iOS 9.2.1 (build 13D15) is an official Apple over-the-air update for the iPhone 6+, released on 2016-01-19T18:32:03Z. The update package is 1.56 GB. 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: 41a1183f6b2d1dfee8f615f5b2641ee7a369890b.zip.