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Push and hold down the power button for 40 seconds the phone will power off make sure the power is off before trying to execute the factory restore steps.
Turn on the phone tablet and follow the steps from the screen
Steps from the physical button
Make sure that the device is fully powered down.
Find your device key combination, and press and hold it to boot your Android device in recovery mode
Combination 1 - Volume Up + Camera button.Combination 2 - Volume Down + Power button.Combination 3 - Volume Up + Power button.Combination 4 - Volume Up + Home + Power button.Combination 5 - Volume Down + Volume Up + Power button.Combination 6 - Home + Camera button.Combination 7 - Home + Power button
Release the buttons when the device is powered on.You will see the device booting into recovery mode.
Press the Volume Up and Volume Down keys to scroll up or down through menu options.
Select Wipe data/Factory reset with the volume keys.
Press the Power button to confirm your selection.
Continuing to use the volume buttons, Select Yes – erase all user data
Your device will now be reset to its factory default state.