Magento 2 shows me this path to the favicon in the source: /pub/static/frontend/xx/MinimalBlack/de_CH/Magento_Theme/favicon.ico

I delete this file and ad my own favicon to my theme here: /app/design/frontend/xx/MinimalBlack/Magento_Theme/favicon.ico

But it creates me always the Magento favicon in the static folder, not my favicon. What's wrong?