iOS 9.9.10.0.1 (build 14A403) is an official Apple over-the-air update for the iPhone 6, released on 2016-09-13T16:56:21Z. The update package is 1.39 GB. This is a delta (partial) update that requires 8.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 17e553327f33aca46d27410c64ed33dbf1c5861b.zip.