iOS 9.9.10.3.1 (build 14E304) is an official Apple over-the-air update for the iPhone 5 (GSM), released on 2017-04-03T17:00:25Z. The update package is 1015.92 MB. This is a delta (partial) update that requires 9.0.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 63c70df044ba40db922e9fe95035c59a9cd83b85.zip.