iPadOS 8.4 (build 12H4086d) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2015-04-27T17:47:05Z. The update package is 146.34 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: 2789afa00e3b241c8a4148afd83916145be39314.zip.