iPadOS 13.4 (build 17E5223h) is an official Apple over-the-air update for the iPad Air 3 (WiFi), released on 2020-02-05T18:16:49Z. The update package is 771.5 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: ec8f9c149e32e45b15c1649455af0f20c4095d15.zip.