iOS 13.3.1 (build 17D5026c) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2019-12-17T18:13:21Z. The update package is 285.02 MB. This is a delta (partial) update that requires 13.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: af62cd03e462d5027aa8ef075925d62b73e228d1.zip.