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There is no reset button, but there is a way to do the reset. Disconnect it from the charger. Then hold down the Power button for 10-20 or 20-40 continuously and this will reset it. If that didn't work, then do the reset while connected to your computer.
If that didn't work, then hold down Volume down and Home button for 10-20 seconds (don't do factory reset if asked)
Please let me know if that didn't work, so we can continue troubleshooting.