Step 1. Become a beta tester
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.
Step 2. Update software
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.
Those in the USA must sign up through the Samsung app.
** Participation in the beta program requires a Samsung account. Create an account at: https://account.samsung.com/
*** The One UI Beta Program may only be available to certain devices, OS, and countries. Galaxy S9/S9 with Android 9 Pie.
**** Beta program period and compatible devices vary by country.