iPadOS 9.1 (build 13B5130b) is an official Apple over-the-air update for the iPad mini 4 (Cellular), released on 2015-09-30T17:58:09Z. The update package is 215.31 MB. This is a delta (partial) update that requires 9.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5ea073437d52d9b7586cd1d586c4d9ae0a466add.zip.