How do you hard reset oioo tablet?

To hard reset an OIOO tablet, first turn off the device completely. Then, press and hold the Volume Up button and the Power button simultaneously until the tablet logo appears. Release both buttons to enter the recovery mode, and use the volume buttons to navigate to the "Wipe data/factory reset" option, then confirm with the Power button. Once the process is complete, select "Reboot system now" to restart the tablet.