iOS 13.3.1 (build 17D5050a) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2020-01-22T18:07:19Z. The update package is 194.96 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: 07ef6db0b224256d09a643c653d4436605e7688f.zip.