iOS 9.9.11.4 (build 15F79) is an official Apple over-the-air update for the iPhone 6s, released on 2018-05-29T17:16:23Z. The update package is 1.46 GB. This is a delta (partial) update that requires 9.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 469cc49eb8714f71210b231df8c19ecc6e62cfb8.zip.