iOS 13.3.1 (build 17D5050a) is an official Apple over-the-air update for the iPhone 8 Plus (Global), released on 2020-01-22T18:07:20Z. The update package is 206.37 MB. This is a delta (partial) update that requires 13.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 141f81cd56c512aeaf5f89247c81b3983a6c6a51.zip.