iOS 9.9.11.4 (build 15F5037c) is an official Apple over-the-air update for the iPhone 6, released on 2018-04-02T17:06:56Z. The update package is 1.84 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: d1397df0e6e1df4abc233a86c522151c63b8b576.zip.