iPadOS 8.4.1 (build 12H321) is an official Apple over-the-air update for the iPad 4 (Global), released on 2015-08-13T18:05:09Z. The update package is 666.46 MB. This is a delta (partial) update that requires 8.0.2 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 92565b5b4fc94461218f2735920360b1b43f5ba9.zip.