Hard Reset QMOBILE Noir A8

Switch off your cell phone.
Next hold and press this keys: Volume Up + Volume Down + Power button, or Volume Up + Power button.
Then select this option "Recovery mode" using Volume Up button.
Now from the menu of Recovery mode select "wipe data / factory reset" using Volume Down to scroll, and Menu key to confirm.
Afterwards choose "Yes -- delete all user data".
In the end to reboot your phone select "reboot system now".
Well done!