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 236.11 MB. This is a delta (partial) update that requires 9.0.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 022c37325a65ed92b5620eae78f573571580827e.zip.