iPadOS 8.4 (build 12H4098c) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2015-05-11T17:46:06Z. The update package is 139.03 MB. This is a delta (partial) update that requires 8.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 3ed486b580d42e5344bae08b63b1d896cd443c88.zip.