Blue LED do not blink after eMMC version firmware burning for DuoS

I follow the steps refer to the website Duo S | Milk-V. After I finished the step usb_dl.exe -s linux -c cv181x -i .\rom. The INFO told me USB download complete but the blue LED did not blink. And balenaEtcher cannot find the device.

What’s the problem? Is there any wrong with EMMC? Thanks.