iPadOS 8.4.1 (build 12H321) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2015-08-13T18:05:12Z. The update package is 408.55 MB. This is a delta (partial) update that requires 8.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 26a73d2161c54ffa46c3c5ea1e252ed46862a564.zip.