Soft Reset Dopo M975 Android 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 to hard reset android tablet without the pattern, Hard reset android tablet with power button only. my acer tablet wont go past the android logo on power up and i did a hard factory reset and it still stays there?.

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