iOS 13.3.1 (build 17D5026c) is an official Apple over-the-air update for the iPhone 11 Pro Max, released on 2019-12-17T18:13:30Z. The update package is 254.39 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: d6ae74e2be5f20bddeacf34316c99618c24b5346.zip.