iPadOS 9.9.15.2 (build 19C56) is an official Apple over-the-air update for the iPad Pro 4 (12.9-inch, Cellular), released on 2021-12-13T18:27:42Z. The update package is 4.86 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: 8d0fe8771c501d88b1014a3c36b301934e937337.zip.