iPadOS 9.9.15.2.1 (build 19C63) is an official Apple over-the-air update for the iPad Pro 4 (12.9-inch, Cellular), released on 2022-01-12T18:07:44Z. 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: 41a718354c566990ac3961e61ffa39157da62cf2.zip.