iPadOS 8.4 (build 12H143) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2015-06-30T15:51:17Z. The update package is 1.5 GB. This is a delta (partial) update that requires null already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 8205ad4a59f4e49286ef6e23738499c695b7a9b1.zip.