iOS 10.2.1 (build 14D23) is an official Apple over-the-air update for the iPhone 6, released on 2017-01-09T17:55:55Z. The update package is 59.85 MB. This is a delta (partial) update that requires 10.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 32ad30e021d5265b5df86cea2b3b37cb7c2082cd.zip.