iPadOS 9.3.5 (build 13G36) is an official Apple over-the-air update for the iPad 2 (GSM), released on 2016-08-25T16:53:07Z. The update package is 822.01 MB. This is a delta (partial) update that requires 8.1.1 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 645f651a4e997c5a6a3e4e8cf9c9a9c086fb966b.zip.