iPadOS 8.4 (build 12H4125a) is an official Apple over-the-air update for the iPad Air (WiFi), released on 2015-06-09T17:53:03Z. The update package is 139.47 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: 370d38ba834661b07e2733862914d77a612e45dd.zip.