iOS 9.9.11.3 (build 15E216) is an official Apple over-the-air update for the iPhone 6s, released on 2018-03-29T17:12:35Z. The update package is 1.46 GB. This is a delta (partial) update that requires 9.3.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e5a5035c11fb961d693d9ae1b2af0aa6f66a7d63.zip.