Bought a VEVOR 3020 mini CNC (usb) from EBAY's page :

http://www.benl.ebay.be/itm/252707953708?ul_noapp=true , a Chinese seller named "discoundesignsltd" .

They delivered the machine with a CD , containing software and activation code coupled to the serial number of the controller box . ( using a JP-382C usb controller/motor driver board )

Worked fine, until the program did an automatic update of the PC program & firmware of the controller box.

After that the serial of the box was changed , and the CNCUSB controller program

( from PlanetCNC ) felt down to trial mode .

The Chinese sent me a new activation code for the altered serial no ,

Worked again , but after one use the serial of the controller was changed again ... Same story.

Anyone who knows what's wrong and what can be done to get this CNC permanently working ?

Best Regards

Roland