iOS 13.3.1 (build 17D5026c) is an official Apple over-the-air update for the iPhone 8 Plus (Global), released on 2019-12-17T18:13:22Z. The update package is 285.24 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: bc4f759b696e6371c595039906cfdc53ee5273a5.zip.