iPadOS 8.4 (build 12H4098c) is an official Apple over-the-air update for the iPad 4 (WiFi), released on 2015-05-11T17:46:04Z. The update package is 114.88 MB. This is a delta (partial) update that requires 8.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 22a956c3256ff5babb2e06fb42ba2b3afd96b42f.zip.