How to remove elgg icon in elgg 2.01?

I am using elgg 2.01 and want to remove elgg icon.I tried a lot and finally found the location which is...vendor/elgg/elgg/engine/lib/views
What I did actually,
I changed favicon.ico to favicon.png from views(php) and uploaded my images to _graphics folder(i.e I changed the core files which I should not do).
So,Please tell me how can I override that file to have my own icon.
Thanks in advance!!!