Galaxy S9 One UI 2.1 update slated for June release in Korea - SamMobile
This is the Galaxy S9 One UI 2.1 firmware being tested by Samsung - SamMobile
Samsung Will Update Galaxy S9, S10, Note 9 And Note 10 With One UI 2.1
Tech Mi News - Samsung Galaxy S9 and S9+ start receiving their One UI 2.1 update, The latest June 2020 security patch is included as well. What you need to know Samsung
Samsung Galaxy S9 and S9+ get One UI 2.1 - GSMArena.com news
Update: T-Mobile S9/S9+] One UI 2.1 now rolling out for the Samsung Galaxy Note 9