iPadOS 9.3.5 (build 13G36) is an official Apple over-the-air update for the iPad 2 (Mid 2012), released on 2016-08-25T16:53:08Z. The update package is 826.3 MB. This is a delta (partial) update that requires 8.0 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 8cf7106aefe0f08953dfb8ad67d9c6b39ff554c1.zip.