iOS 9.9.11.0.2 (build 15A421) is an official Apple over-the-air update for the iPhone 6, released on 2017-10-03T17:04:14Z. The update package is 1.55 GB. This is a delta (partial) update that requires 8.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 505c6552b3fd90b5215ff0aed31d21fe3a1419dc.zip.