There is only one BIOS left to try I wont bother I think; the chance it will suddenly work is slim I believe.
I v heard only good things about the b450's and x470's from MSI and I wont rule them out completely just because one board was garbage
would be neat if u could recommend one that fits what I need it for besides the msi b450 tomahawk/mortar btw. how much difference in performance and vram is between tier a and b? is it signifcant