iPadOS 8.1 (build 12B407) is an official Apple over-the-air update for the iPad Air (WiFi), released on 2014-10-07T18:06:06Z. The update package is 35.9 MB. This is a delta (partial) update that requires 8.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e4f0d5473a19e15138288de2bae9bea8551b1720.zip.