update firmware

Hello,

I have a sdc2130 motor controller, when i update the firmware with SDC21x0-Firmware-Update-v12-120412.dfu I reboot and my pc said \"USB device no recognice \", after I install SDC21x0-Firmware-Update-v12-121111.dfu and the motor controller its ok, although I asked with ?VAR and I can see VAR=0:0:0:0:0:0:0:0:0:0 , please can you tell me whats happend ?

Thanks,

Sometimes this error message happens after an update. If you power down the controller, and close out the roborun+ program, and then open roborun+ and power on controller, does the usb become recognized that roborun detects your controller?