[BeagleBone Black] U-Boot USB Access

I have BeagleBone Black Wireless. In the U-Boot, usb start command returns:
USB0: Port Not Available
(I have a USB Stick inserted in the USB port)

What is missing?

thank you,

What version of U-Boot is your device running?

Our current shipping version on the BeagleBone Black Wireless with a USB Flash drive: http://beagleboard.org/latest-images

=> version
U-Boot 2019.04-00002-g07d5700e21 (Mar 06 2020 - 11:24:55 -0600), Build: jenkins-github_Bootloader-Builder-137

arm-linux-gnueabihf-gcc (Linaro GCC 6.5-2018.12) 6.5.0
GNU ld (Linaro_Binutils-2018.12)
=> usb start
starting USB...
USB0:   scanning bus 0 for devices... 1 USB Device(s) found
       scanning usb for storage devices... 1 Storage Device(s) found
=> ls usb 0:1
            System Volume Information/
   336154   SENSING1_BL.bin
   319770   SENSING1.bin

2 file(s), 2 dir(s)



Thank you for your help.

I think the BBB shipped with old version. I downloaded the latest image and flashed into eMMC. Now the usb start command works.