https://wccftech.com/msis-entire-400-series-x470-b450-motherboards-support-amd-ryzen-5000-zen-3-desktop-cpus/

In an official press release, MSI has confirmed that it's entire 400-series motherboard lineup will feature support for AMD's Ryzen 5000 Desktop CPU family based on the Zen 3 core architecture. The announcement comes days after motherboard manufacturers started rolling out their BIOS updates for existing 500-series motherboards to support the next-generation lineup.

MSI has assured users of their commitment to support 400-series motherboards based on the X470 and B450 chipset. Their entire lineup will be ready to support AMD's Ryzen 5000 Desktop processor lineup which launches next month on the 5th of November however the BIOS for the 400 series motherboards will be rolled out in January 2021.