I am trying to programmatically change pro sites blog level based on blog id. Didn't find the correct solution yet.
I think there it could be done with:
update_blog_option( $blog_id, ...);
is there any hook I can refer to?
update_blog_option( $blog_id, '2');
(by default it will be set to 1) but it didn't work.
At this point anything would be consider good to get me closer to this solution.