This is the Galaxy S9 One UI 2.1 firmware being tested by Samsung - SamMobile
The Samsung Galaxy S9 and S9+ One UI 2.1 update may be released as soon as this week - PhoneArena
Samsung begins rolling out One UI 2.1 update to the Galaxy S9 series - Neowin
Galaxy S9 Plus One UI 2.1 Update - Samsung Members
Download Samsung Galaxy S9 One UI 2.1 Update [Stable Build]
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
One UI 2.1 coming to Galaxy S10, Note plus S9 and Note 9 - 9to5Google
Samsung rep hints at One UI 2.1 for Galaxy S9 being on the cards, again - SamMobile