iPadOS 9.3.5 (build 13G36) is an official Apple over-the-air update for the iPad 3 (WiFi), released on 2016-08-25T16:53:11Z. The update package is 1006.06 MB. This is a delta (partial) update that requires 8.1.2 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: b21e79eccf9bfc2adbf6c0f0278257baa4e2f7b8.zip.