Change kibana logo

Hello everybody, can someone please help change the kibana logo, I tried changing favicons like it was stated here Custom Logo Kibana 7.9.2 (guide) by replacing the images by my own custom logo but nothing changed (see image), also when I opened the file /usr/share/kibana/x-pack/plugins/security/target/public/4.plugin.js to change at least the login logo and the text, the file was empty. I am totally new to ELK please can someone help me with this matter, I am lost
image

this is the issue for official custom logo support: Easy way to customize Kibana logo and theme · Issue #17879 · elastic/kibana · GitHub

The guide you've shared worked for 7.9.2,
which version are you at?