iOS 9.9.17.5.1 (build 21F90) is an official Apple over-the-air update for the iPhone 13 Pro Max, released on 2024-05-20T17:23:31Z. The update package is 5.86 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: f94bc73d108a28355c3fdc0820e37d85890e39a9.zip.