iOS 13.3.1 (build 17D5044a) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2020-01-14T18:21:16Z. The update package is 256.88 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: 8b860752f8fb6ccc92fb9bd134db1bc1379a70c3.zip.