iPadOS 8.3 (build 12F69) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2015-04-08T17:56:09Z. The update package is 398.15 MB. This is a delta (partial) update that requires 8.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 32df18482b30d96b0dc1bd41e08e6f88c98799ea.zip.