iPadOS 9.1 (build 13B143) is an official Apple over-the-air update for the iPad mini (WiFi), released on 2015-10-21T17:15:49Z. The update package is 820.39 MB. This is a delta (partial) update that requires 8.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f823aa1388fe067bf896ed9730d9199fbf3e6fa0.zip.