iOS 13.3.1 (build 17D5044a) is an official Apple over-the-air update for the iPhone 11 Pro Max, released on 2020-01-14T18:21:10Z. The update package is 252.87 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: 2ac3d62a25dfcc3dcbf3c7dc5722e54e6008b4f6.zip.