iOS 9.9.10.3.1 (build 14E304) is an official Apple over-the-air update for the iPhone 6+, released on 2017-04-03T17:00:30Z. The update package is 1.71 GB. This is a delta (partial) update that requires 8.0.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 2d574eb7471bb67d83fa72824165fe679d55d5d5.zip.