iOS 9.9.10.2.1 (build 14D27) is an official Apple over-the-air update for the iPhone 6, released on 2017-01-23T18:08:30Z. The update package is 1.42 GB. This is a delta (partial) update that requires 8.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 12fafa6a3a365db00177195071e4c62a2005d51c.zip.