https://wccftech.com/apple-seeds-beta-2-of-macos-big-sur-11-4-to-developers-download/

Apple has seen fit to release macOS Big Sur 11.4 to developers for testing purposes. The new beta build arrives two weeks after the company released beta 1 to developers. The earlier beta featured support for AMD GPUs. If you are a developer, you can download the latest build from the Apple Developer Center. Let's dive in to see if Apple has added more forward-facing additions with the new build.

As mentioned earlier, if you are a developer, you can download the latest macOS Big Sur 11.4 beta 2 on your compatible Macs right now. The new update can be downloaded from the developer center or via an over-the-air mechanism. However, make sure that you are running a proper configuration profile from the Developer Center. Simply navigate to System Preferences > Software Update and you are all good to go.