iOS 13.3.1 (build 17D5026c) is an official Apple over-the-air update for the iPhone 7 Plus (GSM), released on 2019-12-17T18:13:38Z. The update package is 259.68 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: fe40892f32d762bbb4e0119ddad866575cf30c3e.zip.