Hello,
When the device is switched off, please hold down the volume up button then press the power button to turn on the device.
You will be directed to a 'System Recovery window'. Using the volume down button please go to 'Wipe cache partition'. To select this press the power button again and you will see the tablet wiping the 'Cache'
The selected bar will then go back to 'Reboot System Now', ensure this is highlighted and press the power button to use this command. The tablet will then restart and should be in working order.
PLEASE NOTE: This may not be available on all devices, as some have internal volume options.
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