When you fix the boot, then you can try to activate the driver following the steps described by e-consystems from your link where it says ‘Enabling HID support’.
And for enabling usb 3.0 following just the steps derived from the Jetson wiki, would be enough, at least was enough in my case http://elinux.org/Jetson/Cameras. No need of flashing or changing the bootloader to U-boot as e-consystem describes.