ASUS will support the X470 and B450 chipsets into Zen 3, the company has confirmed. It has reaffirmed support for the two chipsets after representatives apparently informed a customer that the X470 chipset would never receive the BIOS upgrade to run Ryzen 5000 processors.
https://www.notebookcheck.net/ASUS-clarifies-its-position-on-Zen-3-support-for-X470-and-B450-chipsets-still-coming-early-next-year.497999.0.html