If you are familiar with PC towers and Windows, then think of it like this:
Push and hold both steering wheel buttons to do a soft reboot is like the Windows 3 finger salute (Control-Alt-Del) to reboot Windows.
If that soft reboot attempt fails or does not correct the problem, then press the brake and try the 2 steering wheel buttons again, which is sort of like the reset button on that PC tower, which forces a hard reboot. Not exactly the same, but close enough for the purposes of this conversation.