iPadOS 15.7.4 (build 19H321) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2023-03-27T17:11:46Z. The update package is 655.36 MB. This is a delta (partial) update that requires 15.7.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9f124eb41c7b3907e6b3ee4c0285b9feb6042fa5.zip.