iOS 9.9.11.4 (build 15F5037c) is an official Apple over-the-air update for the iPhone 6s, released on 2018-04-02T17:06:57Z. The update package is 1.85 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: bce4084f2b3ebab01704b9ca64960f311c2f71cf.zip.