K8200 can not connect to Mac

I just finished the K8200 3D printer and tried to connect to my Mac. However It didn’t work. I tried to follow all the instruction in other topic:

Downloaded FTDI driver, the green and red light re flashing. However, when I clicked the connection, it shows that connection is open and 5 commands is waiting.

My machine doesn’t respond at all. Iam thinking the problem may comes from the Microboard.
Please help me fix it, it took me a long time to build and I need it for my project.

Thank you guys !