iPadOS 9.1 (build 13B143) is an official Apple over-the-air update for the iPad mini 2 (Cellular), released on 2015-10-21T17:15:56Z. The update package is 1.13 GB. 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: e3f40641d8df762fd01afd43baf4fb038671a1ce.zip.