iPadOS 8.4 (build 12H143) is an official Apple over-the-air update for the iPad 2 (CDMA), released on 2015-06-30T15:51:07Z. The update package is 424.01 MB. This is a delta (partial) update that requires 8.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 41c3b21a6a36213e9f5a32fa2c0ae953d64accc2.zip.