iOS 13.4.5 (build 17F5034c) is an official Apple over-the-air update for the iPhone 11 Pro Max, released on 2020-03-31T17:20:25Z. The update package is 371.14 MB. This is a delta (partial) update that requires 13.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 01e617bebde513d2f8228a9809ccf3ad288d3954.zip.