iPadOS 8.4 (build 12H143) is an official Apple over-the-air update for the iPad 4 (GSM), released on 2015-06-30T15:51:11Z. The update package is 346.74 MB. This is a delta (partial) update that requires 8.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 2300e9d83085c76e431304b6fd2deacf69f36920.zip.