update the crazyradio firmware

[jinhy]

I was trying to update my firmware folowing the steps below:
1.cd ~/projects/crazyradio-firmware
2.python usbtools/launchBootloader.py
However it didn't appear to be right. Showed

bitcraze@bitcraze-vm:~/projects/crazyradio-firmware$ python usbtools/launchBootloader.py
Launch bootloader Traceback (most recent call last):
File "usbtools/launchBootloader.py", line 94, in <module>
sys.exit(launchBootloader(True))
File "usbtools/launchBootloader.py", line 60, in launchBootloader
handle.controlMsg(0x40, 0xFF, (), value=0, index=0, timeout=100)
usb.USBError: error sending control message: Connection timed out

Can anyone give me some suggestion to fix this problem? I was using the VM 3.0. Any help will be appreciated.

[jinhy]

The crazyradio can be recongized when using pc-client