iOS 9.9.10.2.1 (build 14D23) is an official Apple over-the-air update for the iPhone 6s, released on 2017-01-09T17:55:40Z. 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: f5086c67ce849c3a4cb1a669f77f61e1771fbd6e.zip.