iPadOS 15.7.3 (build 19H307) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2023-01-23T18:47:57Z. The update package is 1.17 GB. This is a delta (partial) update that requires 15.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 2a25b0bf2d87a64f18bc6a995263d9b337ef5180.zip.