CUBASE 6.5 /ROLAND VS 2480

MY ROLAND VS 2480 WAS WORKING WITH CUBASE ARTIST 6 IN TILL I UPGRADED TO 6.5 HOW TO FIX OR HOW TO GO BACK TO 6 . ( MY ROLAND WORKED FINE TILL I UPGRADE NOW I CAN MOVE FADERS IN CUBASES MIXER AN THEY WILL MOVE ON ROLAND BUT WHEN I MOVE FADERS ON ROLAND AN THEY WILL NOT MOVE IN CUBASE MIXER)

seems your keyboard got also broken…