question for help

Try switching it off then back on again and while holding the power button in, also press the volume up button. That should bring up a menu including factory reset but you will lose any personal files stored when that process runs.
 
This model does not have volume up and down button just has the power button and two other which they go back and to the system settings when the tablet is on. And i don't have root it yet so i can't use the terminal emulator to access the recovery mode and there is no video or something to explain how can i do it!!!