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 1.2 GB. This is a delta (partial) update that requires 9.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 75a383d508e1ad67ecbfcf77645b9c7aa22a5312.zip.