I used a USB stick with other 500 maps and folders and there was no logic order for me to go through all this.
That's why i ditched a lot of folders and music on the USB stick, but after connecting it in the car again, surprisingly I see a lot of folders and musicfiles which I removed from the USB stick (even checked that fact on different computers, as I thought I was start loosing my mind).
Where can I clean the Honda's music memory as I guess it copied the files to the car in stead of leaving on the stick.

 

interesting issue. possible that pulling the HU memory fuse would reset the unit. if your head unit requires a code to unlock, have that handy.