Rock 4C+ gadget usb

Hi,
I’m trying to use gadget usb to emulate mass storage and mouse/keyboard using rock 4C+ but I don’t know how to do. I follow the radxa zero guide https://wiki.radxa.com/Zero/Linux/usbnet but it doesn’t work.
There are usb gadget module in kernel 4.4 but i cannot load it using modprobe. Is there a way to enable and use it?

Thanks