Hello @olafbuitelaar,
Thank you for you response, I have seen that post but I dont konw what to change in the icons.svg , When I have removed it from the server (to test what that file do) all icons on zammad disappeared.
It seems to be one large svg file containing many different images. My standard svg editor doesn’t open it, but svg is just a text file - you can see the icon in question at line 456-478
You could edit that to contain a different logo, or add a new file and change /app/views/init/index.html.erb to point to that. Both would likely revert when you next update, so keep a backup.
I’m guessing here - I’ve not actually tried either of these.