iOS 9.9.11.4.1 (build 15G77) is an official Apple over-the-air update for the iPhone 6s, released on 2018-07-09T17:10:02Z. The update package is 1.46 GB. This is a delta (partial) update that requires 9.3.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: aa1a170cccd0609bec02e4aeb3cf0fd984d3f974.zip.