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If we do a hard reset, you will be able to use the tablet again, but it will erase all installed programs. It will be in "like-new" condition. Is that ok?
If you want to do that, make sure that the tablet is turned off. Then hold the vol down button while pressing the power button. When you see signs that the tablet has turned on you can release the power button, but still continue to hold volume down. You will come up to a menu which includes "Restore to factory settings". Let go of the volume down button. Use the volume up and down buttons to select the option, then press the power button to activate the option. It will warn you about losing your data. Then it will do the reset. When it's done you will have access to your tablet again.