Sometimes Slamdunk doesn't boot

Hi, I have a trouble with slamdunk.

slamdunk doesn’t boot.

I connected slamdunk using HDMI cable and I can see a message
’Stopping MCU Update [OK]’

I waited more than 5 mins, but it didn’t boot.

Sometimes it works 1 or 2 times of 10 tries.

How can I solve it?
thanks.

@KevinAhn I am facing the same problem. Did you solve it?