iOS 9.9.14.5.1 (build 18E212) is an official Apple over-the-air update for the iPhone 11 Pro Max, released on 2021-05-03T17:13:51Z. The update package is 4.87 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: 48a777cb4e26de3d5c36af144b35c4fde7bb34eb.zip.