iPadOS 8.4.1 (build 12H321) is an official Apple over-the-air update for the iPad 2 (Mid 2012), released on 2015-09-16T18:02:04Z. The update package is 986.29 MB. This is a delta (partial) update that requires 7.0.2 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: f85a28b421f58a0eaf23127329bc10b4e8dd22a1.zip.