I installed B9S on my new 3DS when my 3DS is on firmware 11.3. Later I updated it to 11.7. Then I region changed it from JP to US and the 3DS is downgraded to 11.5. I updated it again and the version shown in system setting is "Sys 11.7.0-40U". A few weeks later, Nintendo released the firmware 11.8 and I updated it. Then the version shown in system setting is changed to "Ver 11.8.0-41U". Is the CFW still there?
(Note: FBI still works.)
(Note: FBI still works.)