Admin custom widget, and widget removal

add_action('wp_dashboard_setup', 'my_custom_dashboard_widgets_author');
 
function my_custom_dashboard_widgets_author() {
 
	   global $wp_meta_boxes;
 
		unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_plugins']);
		unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_primary']);
		unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_secondary']);
		unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_right_now']);
		unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_recent_comments']);
		unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_incoming_links']);
		unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_quick_press']);
		unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_recent_drafts']);
 
	   wp_add_dashboard_widget('custom_help_widget', 'Titulo de un magnifico widget', 'custom_dashboard_help');
}
 
function custom_dashboard_help() {
   echo '<p>lorem ipsum dorem ponem</p>';
}