iOS 9.9.15.3 (build 19D50) is an official Apple over-the-air update for the iPhone 13 Pro Max, released on 2022-01-26T18:14:51Z. The update package is 4.83 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: 5f66c8ffb78ced1eb7ca9fa9a7a38a833fea553a.zip.