iOS 9.9.10.2.1 (build 14D5010) is an official Apple over-the-air update for the iPhone 6s, released on 2016-12-14T17:58:26Z. The update package is 1.7 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: 1bea36f3f3bd045d2de31cc496f953fb19c6c6a1.zip.