iPadOS 9.9.12.1 (build 16B5084a) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2018-10-15T17:03:01Z. The update package is 2.02 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: db937e41bd0c2a6a796592d24895d6e53fb8d9cc.zip.