iPadOS 8.2 (build 12D508) is an official Apple over-the-air update for the iPad 4 (WiFi), released on 2015-03-09T18:49:03Z. The update package is 1.06 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: 259ea8cc7a47bbe5a07b6150e1f5828b5205b5a6.zip.