iOS 9.9.15.4.1 (build 19E258) is an official Apple over-the-air update for the iPhone 13 Pro Max, released on 2022-03-31T17:14:45Z. 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: 3988dc18d11164458dcb1c3303524f6185fa021f.zip.