iOS 9.9.17.2.1 (build 21C66) is an official Apple over-the-air update for the iPhone 13 Pro Max, released on 2023-12-19T18:58:08Z. The update package is 5.76 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: 79809c332dc74a09fc40ed3d109e5300543d86d5.zip.