Hi Twinster and welcome, hope these instructions help you.
Follow these steps.
1. Press and hold the Volume Up + Volume Down + Power.
2. Release the buttons when the device powered on.
You’ll see an image of an Android lying on its back with its chest open and its internals revealed.
3, Press the Volume Up and Volume Down keys to scroll through the options until you see Recovery mode on the screen.
4. Press the Power button to restart into recovery mode. You’ll soon see an Android with a red triangle.
5. Hold down the Power button and tap Volume Up. You’ll see the Android system recovery menu appear at the top of your screen.
6. Select wipe data / factory reset with the volume keys and tap the Power button to activate it.
7. Select Yes – erase all user data with the volume buttons and tap Power. Your device will be reset to its factory state and all your data will be erased. If your device freezes at any point, hold down the Power button until it restarts.
