Can't Change Favicon


I’ve been trying for hours and hours to change my favicon on the following site:

I want to change the favicon to what’s shown in the following:

I have tried EVERYTHING, including deleting all other favicons in the site, changing the header.php file in my child theme, placing the favicon in any and all folders where it might be seen, and trying a plugin. I’ve run out of ideas!

Can you help? Many Thanks!