Your USB device is a one that I am not aware of.
Frankly, no one is going to provide you a LEGIT Mach3 license and controller board for $139.00.
Next, problems you have with that board should be addressed by the vendor. The board is taking care of
some of the functions that Mach3 would normaly do. Unless someone on this site has specific knowledge about that board you are not going to get much help here.
Your backlash problem is a good example. It is not as easy as the Chinese may think.
Just trying to save you some time and avoid having other site users try to problem solve a matter that is not
MACH3 related.
RICH