How can I become a member in a LLC that already has 2 members? what would my share profit be?

there's this restaurant i'm interested to put money in. my friend has 51% and his partner 49%. my friend needs money and i'm able to put more than his partner but less than him. the problem is that this partner is also the administrator of the restaurant and doesnt want to give up his 49% neither his roll. Can my buddy take him out of that position and redo the whole share profit proportionally since he is the "majority" and put me in?