iPadOS 11.1 (build 15B5086a) is an official Apple over-the-air update for the iPad mini 4 (WiFi), released on 2017-10-16T17:03:58Z. The update package is 110.28 MB. This is a delta (partial) update that requires 11.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 22f7483e3a98caf0d6228e851244d1e61617198e.zip.