iOS 13.3.1 (build 17D5044a) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2020-01-14T18:21:02Z. The update package is 183.62 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: ac83bb820c20d82a3930069d7151f541c7a6e592.zip.