Hi Kano,
I was trying to upgrade from 2.7.6 to 2.11.3
I followed your procedure to update BFL device driver to WinUSB. Downloaded zadig (for Windows 7), run it as administrator.
I got an error installing WinUSB driver. Here is the Zadig debug log:
http://www.petermoss.com/akbash/zadig_install_logCan you add FTDI driver support as an option? As it is now, I can only use 2.10.5 version.
You'll have to ask the zadig devs.
The FTDI driver blocks direct USB access with libusb, that is why WinUSB is required.