iOS 13.3.1 (build 17D5026c) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2019-12-17T18:13:37Z. The update package is 259.46 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: c7a65cb8bb8a1e9991351f4c5c8beba92bd033e8.zip.