Samsung One UI Beta is officially live. Both are available for Galaxy S9 and S9+. The official beta will allow you to test the new user interface in combination with Android Pie.
As of right now the One UI beta is only available for South Korea but will soon be available for German and US audiences. You may opt to register for the beta on the official Samsung Galaxy Website or just tap the notices button on your Galaxy S9 or S9+.
Download the Samsung Members application from Galaxy Apps or the Google Play Store. After logging in, go to Notices and select “One UI Beta Program Registration” to submit an application. Once signed up, go to Settings and then Update Software to select the Download Updates Manually option. This will allow the software to update and load the beta version.
Once you’re enrolled, Android Pie will also be available for download. Make sure to download the update manually and don’t forget to backup your files.