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 860.04 MB. This is a delta (partial) update that requires 8.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 7f391a6353538d91053d5004dd7bc09aa12cae45.zip.