My Volumio always Shows the first Track on CD as unknown Even if the Track is known at the harddisk
Do you mean a file created from a CD that is in your music library?
Do you mean you are playing or ripping an actual CD using Volumio?
You need to explain the circumstances of the issue a bit more fully/clearly.
I have this same problem. I ripped many CDs from Mac and PC to a network file server. FLAC format. The only cds affected are Classical CDs, and not all of them either - about 50%. All have the details of composer and track details visible in File Manager/Finder.
Use a tag editor such as MP3Tag to check and correct the tags.