GM MDI Multiple Diagnostic Interface NO connection problem can be solved by reflashing MDI diagnostic scanner.
Reflash GM MDI:
step 1 press button and connect with power
2 wait about 10 secs ,keep press the button,no stop
3 when all light turn on,you can take off the button
4 connect with usb key ,prepare for reflash
5 open GM Scan tool MDI manager ,choose recover
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