https://wccftech.com/third-galaxy-s21-one-ui-4-0-beta-now-rolling-out-in-more-countries/

It has been a week since Samsung started rolling out the third One UI 3.0 beta update for the Galaxy S21 series in South Korea. Today, the company has decided to update more countries where the beta program is already available.

This is the third Android 12-based One UI 4.0 beta firmware that Samsung has released this year. However, they have skipped the first One UI 4.0 beta in some markets, making this the second release for some of us.