MD-1000I / MD-2000I / MD-3000I Explanation of USB Function
Manual bypass
To activate the manual bypass, proceed as follows:
Press buttons 12 and 8 simultaneously for about 3 seconds, to change from
normal operation to bypass mode.
The LED bypass indicator will blink constantly and an audible signal will sound.
Press buttons 12 and 8 simultaneously for about 3 seconds, to change
from bypass mode to normal operation.
MD Series 27