iPadOS 9.1 (build 13B5119e) is an official Apple over-the-air update for the iPad 2 (WiFi), released on 2015-09-23T17:55:02Z. The update package is 977.68 MB. This is a delta (partial) update that requires null already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: da43d1cab3852219ea9c3cb30f003c157a0ccc9e.zip.