iPadOS 8.4 (build 12H143) is an official Apple over-the-air update for the iPad Air (WiFi), released on 2015-06-30T15:51:12Z. The update package is 749.35 MB. This is a delta (partial) update that requires 8.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: cecc2ba17fb448a1ba0498f786f23bc221d4d0d7.zip.