Tablet [Q] Mid-Android Tablet PC (Made in China)

Hi guys. This is what I was attempting to do.“dev_mount sdcard /mnt/sdcard” and change it to “dev_mount sdcard /mnt/ extsd”. “dev_mount extsd /mnt/extsd” and change it to “dev_mount extsd /mnt/ sdcard”. I was using the supersu and es explorer to change to this format. Apparently something went wrong.Restarted the tablet and no reboot. I did a factory reset .Wipe data, cache and nothing. All I get now is the android word that just scrolls. Can I apply anything to my microsd card and insert it in tablet?