iOS 9.9.10.3.1 (build 14E304) is an official Apple over-the-air update for the iPhone 6+, released on 2017-04-03T17:00:31Z. The update package is 1.3 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: 6a0ca7e94ba04029171cad94dba4cd552b084060.zip.