Hmm seems like the database stuff works in the update script, because i have no activities in usermeta any more. what happens after the db update script? and where the heck is the bb version number to be found in the database?
Wow, that was rather simple, albait I expected it rather to look for something like a “bp-custom.css” to simply overwrite the styles from the default theme, as a “most easy way to tweak stuff”.
I had tryed to do it with a child theme first, but could not get it to work properly so you helped me a lot by setting me right to the starting line.