iPadOS 8.4.1 (build 12H321) is an official Apple over-the-air update for the iPad 2 (Mid 2012), released on 2015-08-13T18:05:07Z. The update package is 302.84 MB. This is a delta (partial) update that requires 8.1.3 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: abfaae98129f36a5018e37d9a2d195eba2b119a2.zip.