STM32F413-DISCO, How can i ru MEMS example

Hi, i have STM32F413-DISCO, this board can do this:

"The demonstration firmware uses the MEMS motion sensor to blink the four LEDs according to the motion direction and speed. Connecting the board to a PC with a second USB 'type A to micro-B' cable converts it into a standard mouse, and board motion controls the PC cursor"

But if i connect board with PC (to first or second USB ob board), i can't see new USB-hid (mouse) device. What's wrong i do? Thank's