I am not able to switch the motherboard and I've just realized that my 3.1 port is already in use, so I think i'll just get a pci card for 20€. Thank you.
While building my pc, I noticed that I couldn't connect the usb-c port of my case to my asrock b450 m4 Pro motherboard because it only has 2 usb 2.0 headers and one usb 3.1. Is there any way to make my usb-c port work?