iOS 13.3.1 (build 17D5050a) is an official Apple over-the-air update for the iPhone 7 Plus (GSM), released on 2020-01-22T18:07:34Z. The update package is 165.85 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: e12b16fd02450d6f05df4aa5f51b427cb7f7799f.zip.