iOS 10.2.1 (build 14D27) is an official Apple over-the-air update for the iPhone 6+, released on 2017-01-23T18:08:26Z. The update package is 1.24 GB. This is a delta (partial) update that requires 9.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 194bf0fa4b2c76134b9b844217e076d57f42cad0.zip.