iPadOS 8.4 (build 12H143) is an official Apple over-the-air update for the iPad 2 (CDMA), released on 2015-06-30T15:51:06Z. The update package is 794.2 MB. 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: a7ef0bd75a3f1ab3f7bd45bf28ab50d3a6226d61.zip.