Someone with the highest end Asus X470 motherboard(ROG Crosshair VII Hero X470) messaged Asus about when the Zen3 BIOS update would happen. MSI and others have already talked about the BIOS updates. Asus replied won't be supporting 400 series motherboards,and told the user to buy one of their 500 series motherboards:
https://www.reddit.com/r/Amd/comment...x470_board_to/
It looks like my Asus Strix B450I,which despite have a 6+1 phase VRM and 32MB BIOS,won't get an update if the X470 Crossfire won't get it. That is the last time I will buy an Asus motherboard,and supports the rumours were that Asus was the OEM pushing most for AMD to drop 400 series Zen3 support. I should have gone with MSI.We have no plans for the Crosshair VII Hero to support the Ryzen 5900X, please purchase Crosshair VIII Hero and any Ass B550 motherboard that will support Ryzen 5900X and 5000 series processors.