How To Restart Frozen Dopo M975 Tablet

Dopo m975 tablet is fully charged and won`t turn on, Dopo m975 tablet is fully charged and won t turn on holding down the volume or and power button does not work resetting didn t work either help. How do i master rest my dopo android md-702 tablet without, Dopo tablet reset button. my dopo m7088 tablet is frozen. reset button and turning it off will not unfreeze. any ideas? i`ve tried to factory reset my son`s rca.

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