Can't flash using Mi Flash, always error in the middle of the process

My cellphone is completely dead, it can't be turned on by long pressing the power button, but it can enter fastboot mode, then I flashed it using the Miflash toolsMy cellphone is completely dead, it can't be turned on by long pressing the power button, but it can enter fastboot mode, then I flash it using the Miflash tools but it gets an error in the middle of the process, what are the methods?