Hard Reset HUAWEI M886 Mercury

First method:

1. From the Home screen, press the Menu Key and touch Settings.
2. Touch the Privacy
3. Touch Factory data reset.
4. Touch Reset phone.
5. Touch Erase everything.

Second method:

1. Power on your device.
   
2. Next goto Settings -> Advanced settings -> Security -> Phone and SIM card and select option Reset your phone to the factory settings.
3. Then enter your password to confirm operation.
   * The default password is: 0000
4. Now wait to finish operation.
5. Good job!

WARNING !
Hard Reset will erase all of your data
All described operations you are doing at your own risk.