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 1.09 GB. This is a delta (partial) update that requires 7.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d25b798fc31592743fedff80b6656c2f04ff352f.zip.