def METHOD_NAME(self):
    """
    Retrieves the cause of the previous reboot
    Returns:
        A tuple (string, string) where the first element is a string
        containing the cause of the previous reboot. This string must be
        one of the predefined strings in this class. If the first string
        is "REBOOT_CAUSE_HARDWARE_OTHER", the second string can be used
        to pass a description of the reboot cause.
    """
    return (self.REBOOT_CAUSE_NON_HARDWARE, None)