iOS 9.9.10.2.1 (build 14D15) is an official Apple over-the-air update for the iPhone 6, released on 2016-12-20T18:02:32Z. The update package is 1.69 GB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b0b5caa2cff7a46583a9ea1d1e264b4df4765da1.zip.