it really seems that CH340 is not installed, where do you get the driver? download LaserGRBL and install the driver from that software, even if they seems similar are not.
look at the date of yours and mine 
it really seems that CH340 is not installed, where do you get the driver? download LaserGRBL and install the driver from that software, even if they seems similar are not.
look at the date of yours and mine