iPadOS 9.9.15.4 (build 19E241) is an official Apple over-the-air update for the iPad Air 4 (WiFi), released on 2022-03-14T17:13:25Z. The update package is 4.17 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: 39df1b35f62e7f68f93f3779e20ee14beaf0cafd.zip.