iPadOS 9.9.12.0 (build 99Z999) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2018-09-12T19:14:21Z. The update package is 1.23 KB. This is a delta (partial) update that requires 9.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f393ae5156319e127a2b21d2f85b66a151c44ff5.zip.