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 154.83 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: 223618e3d9aaac38404273b03a0bcffcf7d4f2d8.zip.