[SOLVED] Mi flash error (Length cannot be less than zero)

Hi everyone;

I'm on MIUI11 hybridOS now, and want to get back to the stock rom.

My bootloader is unlocked (by "fastboot oem unlock" command), the drivers are installed on my PC, I'm using mi flash tool 20191206 (i think it's the latest version), i copied mi flash on drive C, and there is no space in the directory of the rom, and i run mi flash as administrator;

but when i connect my phone (in the bootloader mode) to the computer, mi flash doesn't detect it and shows the error "Length...

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