iPadOS 8.4.1 (build 12H321) is an official Apple over-the-air update for the iPad 3 (CDMA), released on 2015-08-13T18:05:08Z. The update package is 642.78 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: a1cca782461bb54bd10d61bd90455ec264df1696.zip.