iOS 9.9.13.1 (build 17A5844b) is an official Apple over-the-air update for the iPhone 11 Pro Max, released on 2019-09-19T17:28:51Z. The update package is 3.22 GB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 6b7f8c26e79a04a8b64cd3dd8756d94778fc243e.zip.