Filter to add a custom favicon to your Genesis child theme.

genesis-custom-favicon.php

<?php

/**
 * Add custom Genesis favicon
 * 
 * Dude, replace the default Genesis favicon so you don't look like a n00b.
 * Create your custom favicon.ico and place it in your child theme's directory.
 * Add this code to your child theme's functions.php
 * 
 * Images can be converted to the .ico format here: http://www.favicon-generator.org/
 *
 * @author  John Regan ([email protected])
 * @filter  genesis_pre_load_favicon
 * @uses    get_stylesheet_directory_uri
 * @param   string  Default Genesis favicon URL
 * @return  string  Custom favicon URL
 */
add_filter( 'genesis_pre_load_favicon', 'my_custom_favicon' );
function my_custom_favicon( $favicon_url ) {
	
	return get_stylesheet_directory() . '/favicon.ico';
	
}

return get_stylesheet_directory_uri() . '/favicon.ico' ;

Hope, you will update soon.