iPadOS 8.4.1 (build 12H321) is an official Apple over-the-air update for the iPad 4 (WiFi), released on 2015-09-16T18:02:05Z. The update package is 1.32 GB. This is a delta (partial) update that requires 7.0 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 1505379885d82afd2e0130f6ceb3263d8b9e2675.zip.