iOS 9.9.11.1.1 (build 15B150) is an official Apple over-the-air update for the iPhone 6s, released on 2017-11-09T18:10:45Z. The update package is 1.32 GB. This is a delta (partial) update that requires 9.3.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: dca427969547b8dc6eef76d35e114b524c49b555.zip.