1. Reinstall the driver

1. Open Device Manager
   

2. In Device Manager, find “USBLMC” under “Other Devices"
   

3. Hover over “USBLMC,” then right-click and Click the “Update Driver”
   

4. Click the “Browse my computer for drivers”
   

5. Click the “Browse”
   

6. Click the “Local Disk (C:)”
   

7. Click the “Program Files (x86)”
   

8. Click the “MAGICEngrave-Laser”
   

9. Click the “Driver”
   

10. Click the “for win7 & win8 & win10 64bit”
    

11. Click the "OK" button
    

12. Click the "Next" button
    

13. Installing drivers
    

14. Click the "close" button
    

15. Check that it is properly connected.
    

Go to the L3 Care➜