iOS 9.9.12.1 (build 16B5077c) is an official Apple over-the-air update for the iPhone 6s, released on 2018-10-09T17:05:59Z. The update package is 2.14 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: 4d5751e22c98c8c513cb0ce52addd09c7ea1f2af.zip.