https://wccftech.com/samsung-pushes-the-galaxy-s21-one-ui-4-0-beta-to-an-unknown-date/

We all know that the Android 12 based One UI 4.0 beta for the Galaxy S21 series is happening, and Samsung knows it too. However, the company never really announced an official release date for the first beta except for saying that the beta will be available sometime in September, which is not really surprising to begin with. We have some information suggesting that the beta was supposed to be released today, but that is no longer the case.

According to a tweet from FrontTron, the One UI 4.0 beta has been delayed and will not be releasing today. Sadly, the information is not coming directly from Samsung. So, we would advise you to take it with a grain of salt as we can neither confirm nor deny if it will happen. However, when you are talking about beta software, delays are a common thing, and if that is the case, we believe Samsung had reason enough to delay the update.