iPadOS 11.1 (build 15B93) is an official Apple over-the-air update for the iPad mini 4 (WiFi), released on 2017-10-23T17:03:50Z. The update package is 163.7 MB. This is a delta (partial) update that requires 11.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: bb981c9d8811a873f523c5b2a473bc76a7f6fa0f.zip.