iOS 9.9.10.3.1 (build 14E304) is an official Apple over-the-air update for the iPhone 6, released on 2017-04-03T17:00:33Z. The update package is 1.31 GB. This is a delta (partial) update that requires 9.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 58f2f1260f7e39d962cb5bcba14f9dfd40a7d004.zip.