Beagleplay DFU not working

I am trying to access Beagleplay DFU but it doesnt work. I corrupted eMMC and now I am able use prebuilt bootloaders (tiboot3.bin, tispl.bin, u-boot.img) for android via microsd card. But if I dont insert microsdcard and hold pushing USR button, it should switch to backup mode DFU mode and it should try to boot from USB right?. I could not achieve that. I list the usb devices there is no VID 0x0451 and PID 0x6165. I changed cables, tried different computer, it did not work. I appreciate any help. Thank you.