iPadOS 8.4 (build 12H143) is an official Apple over-the-air update for the iPad 2 (WiFi), released on 2015-06-30T15:51:05Z. The update package is 204.03 MB. This is a delta (partial) update that requires 8.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 30e6b176d15487cd2e8a9495a8be5c1e0bd3fbf0.zip.