iOS 9.9.15.1 (build 19B74) is an official Apple over-the-air update for the iPhone 13 Pro Max, released on 2021-10-25T17:10:16Z. The update package is 4.89 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: 9c047425b1cc1c8a700f62954532b1584d0a3925.zip.