iPadOS 8.4.1 (build 12H321) is an official Apple over-the-air update for the iPad 2 (WiFi), released on 2015-08-13T18:05:06Z. The update package is 303 MB. This is a delta (partial) update that requires 8.1.2 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 76c2c3d2c0eb5eae738daf193672f72a058afe91.zip.