iPadOS 9.3 (build 13E233) is an official Apple over-the-air update for the iPad Pro 12.9-inch (Cellular), released on 2016-03-21T18:56:10Z. The update package is 293.77 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: fa695a4e4a7d16e5e5347962d860c3e683bd981f.zip.