iPadOS 9.1 (build 13B5119e) is an official Apple over-the-air update for the iPad mini 4 (WiFi), released on 2015-09-23T17:55:06Z. The update package is 180.45 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: 172ecfddde135547cff6e3471de70f658d99ff57.zip.