iOS 9.9.11.3 (build 15E216) is an official Apple over-the-air update for the iPhone 6, released on 2018-03-29T17:12:23Z. The update package is 1.63 GB. This is a delta (partial) update that requires 8.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d3eb59f8259a40a244abab77f638f123cd805844.zip.