iPadOS 8.4.1 (build 12H321) is an official Apple over-the-air update for the iPad 2 (CDMA), released on 2015-08-13T18:05:06Z. The update package is 794.29 MB. This is a delta (partial) update that requires 7.1.1 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 01db71b9226c29c3acfb67ce4b89d481d7cf5e06.zip.