i have a SPICE COOLPAD MI 515 AND I CANT ACCESS TO MY STORAGE
You could try editing the file over an ADB interface.
You can install the appropriate drivers and the ADB Interface, and then use a program called PuTTYTray: https://puttytray.goeswhere.com . There, you can use the built-in Linux text editor using the command called vi to edit the vold.fstab file to return your device to its original configuration.