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Power off the tablet.
Hold down the Power and Camera/Volume button until the tablet powers back on
How old is the tablet?
Please ignore this response.
If the buttons do not reset the tablet then there is a hardware failure to the tablet and it would require it to be replaced.
There isn't anymore combination than the buttons that you have tried already. Even though there are a lot of tablets, there are only a couple of methods that reset them.
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