iPadOS 8.4.1 (build 12H321) is an official Apple over-the-air update for the iPad 3 (WiFi), released on 2015-08-13T18:05:08Z. The update package is 641.92 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: 95ba03d5a92d56f7318dae8d850a14d4f15873fa.zip.