iPadOS 8.1.2 (build 12B440) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2014-12-09T17:49:03Z. The update package is 473.13 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: f4165431ef8802bc5c4a3a9bcb923328c0549a13.zip.