How to perform the software reset level is common to all terminals with this operating system: accessing Menu> Settings> About> Reset initial setup.
To reset at the hardware level, the steps by brand terminal would be:
Nokia and Samsung: the phone off, are pressed simultaneously Volume Down buttons, on and camera for a few seconds, until it vibrates the terminal. Once done, we release the button, leaving the other two buttons pressed for about 5 seconds. A confirmation message by double clicking the Windows start button deletion appears.