ASUS Announces UEFI BIOS Support for AMD Ryzen 7 5800X3D and new AMD Ryzen 5000 Series and 4000 Series CPUs for ASUS AM4 X570, B550, X470, B450, X370, motherboards* 83 motherboards listed
All MSI X470 and B450 Will Support AMD Ryzen 5000 Zen 3 CPUs - ThePCEnthusiast
ASUS drops support for Ryzen 5000 processor series on X470 motherboards - NotebookCheck.net News
AMD B450 and X470 chipset will not have support for Ryzen 5000 until 2021 and in beta phase - HardwarEsfera