No USB connection



I began test on M2 since 1 month it was ok until last monday. I use Ardiuno on Visual Studio 2017. Since monday I can’t have USB connection. On Windows system, I can’t see Ardiuno Programming Port.
I checked USB cable and it is ok and tested the USB connection on an other computer and it was the same thing.
Do you think if device is stuck or damned ?
Thanks a lot


Try clearing your M2 and go from there. Somehow you locked up your M2. It is highly unlikely the hardware is damaged unless you hooked up something wrong.


And by clearing he means “plug it into the USB port, hold down the Erase button for about 2 seconds, release the erase button, unplug USB, wait a second or two, plug it back in”. You should then have an erased M2 which will enumerate as a serial port once again (hopefully) but be completely blank so you’ll have to reprogram it.

As Rod said, hardware damage is unlikely. Software glitches can cause it to lock up before the USB code starts running and then it won’t show up as a USB port.


Hi Collin and Rod,

It’s ok my M2 can run now.
Thanks a lot