iPadOS 8.1 (build 12B410) is an official Apple over-the-air update for the iPad Air (WiFi), released on 2014-10-20T17:59:06Z. The update package is 1.31 GB. This is a delta (partial) update that requires 7.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: effea1f129f5b09c6445a84ceb57dec7dbb1d355.zip.