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 398.28 MB. This is a delta (partial) update that requires 8.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: cf52339669523eba6f14d0959cc89912e0bb97fb.zip.