iPadOS 9.3 (build 13E233) is an official Apple over-the-air update for the iPad 2 (Mid 2012), released on 2016-03-21T18:55:31Z. The update package is 187.5 MB. This is a delta (partial) update that requires 9.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5d985e903cbb2dadd4d87c4b2a9ccba0a6cf2dfe.zip.