Hi Andre
Still no luck on the Head-unit, On my Samsung phone & tablet I have change the filing from root to a folder on SD card and everything is great and working as it should without using Legacy File Access Mode.
On the head unit I have installed the latest firmware which I got from the manufacture (Joying) but I still have to use Legacy File Access Mode & still will not write to music folders, I have also change from root to a folder.
Pulling my hair out.
Andy