iPadOS 8.4 (build 12H4086d) is an official Apple over-the-air update for the iPad 4 (GSM), released on 2015-04-27T17:47:04Z. The update package is 119.99 MB. This is a delta (partial) update that requires 8.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 99b8d70360edbc95bf44b4031e3d8dbbde7c310d.zip.