iPadOS 13.4 (build 17E5233g) is an official Apple over-the-air update for the iPad mini 4 (WiFi), released on 2020-02-19T18:24:17Z. The update package is 793.17 MB. This is a delta (partial) update that requires 13.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 0f077643971bc537f6d42376045e7fb07f02ff6f.zip.