Begin the Hard reset by holding the Power key and once you see the option to, select power off.
In the next step, hold the Volume Up + Power key simultaneously till you see the HUADOO logo.
You should now be located in the Recovery mode, from here select Wipe data/Factory reset using the Volume keys and confirm the selection with Power key.
Select Yes so the process can begin removing all personal data.
Nice work, when the process is finished you will be greeted by Android setup screen.
