Hello ! I saw ur video at youtube for fastboot problem, i download rom from xiaomi firmware but the file was not the same , in fact i have win rar and they were many files in it , also miflash isnt working for me it needs some drivers ! I have a huge problem someone please help !
U. n try re installing fastboot .zip
U should also use the same firmware for your device your should use the fastboot firmware
You may need universal adb drivers for mi flash
U can also try to reinstall miflash itself