Take a microSD card out of the slot. (Empty the microSD card slot.)
Press and hold down the power button for a few seconds while pressing and holding down the "Home" (Silver Push Button) button. (Both "Power" and "Home" buttons must be pressed down until he see the phrase "upgrade system activated" in the middle of the screen.
Release both buttons once the phrase "upgrade system activated" appears on the screen.
Wait until it reboots. You will see the following sentences on the left top corner of the screen: Can not find any update image. Press MENU/KEY_VOLUMEUP key to init SD card, Press BACK/KEY_VOLUMEDOWN key to cancel.
Press the "VOLUME UP" key. The volume up key is located at the left side of the unit and the button is closer to the built-in camera than the volume down button.
Wait until it finishes making a partition and shut down the system automatically.
Once the unit is turned off, your system will be reset to the factory settings. Thus, your previous data are lost at this point.
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Turn the tablet all the way off, press and hold the VOL - and power at the same time for 8 to 9 seconds, it will show a green android guy with a system recovery menu. Use vol - to go down to Wipe Data/Factory Reset, press the power button to select it, go down to 'yes' to confirm, press the power button to select it, it will wipe the tablet, you then press the power button on 'reboot system'.