I understand that this problem is not related to armbian.
I tries asking NexDock but they don't know how to make it.
So, I just wonder anybody knows how to let armbian on Rock PI4B work with NexDock 360's keyboard ?
I know when using Raspberry PI, I can add a line
dtoverlay=dwc2,dr_mode=host
to /boot/config.txt. But when using armbian, there is no config.txt in /boot.
Thanks.