iOS 13.3.1 (build 17D5050a) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2020-01-22T18:07:18Z. The update package is 191.16 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: 68c13d448e331bea07b480352eb63d611a837a65.zip.