Hey : thanks to your advice, I found the problem !
When I wanted to install a new scoreboard, I realize that in Pro Evolution Soccer 2009\kitserver\img, the folder was called "rv0c_e.img".... but my game is in French !
I just changed it in "rv0c_f.img" and it worked !

I knew there was something wrong when, before, the background of the menu was totally black !

Thank you. (now, you can notice that in your "readme"

)
Another question : with this patch installed, if I want to put another scoreboard, adboard or other things, there won't be any conflict ?