https://wccftech.com/msi-x570-b550-motherboards-amd-agesa-1-2-0-3-beta-bios-firmware-improved-ryzen-performance/

MSI has also started rolling out the first BETA BIOS based on the AMD AGESA 1.2.0.3 Firmware for its X570 and B550 motherboards. As stated yesterday, the BETA BIOS (PatchA) is designed to offer improved system performance on compatible Ryzen Desktop CPUs and APUs.

While not officially available on MSI's X570 & B550 MAG motherboard product pages, the BETA BIOS is indeed available and working. The BETA BIOS is based on AGESA 1.2.0.3 Firmware that is supposed to offer improved Ryzen CPU and System performance. Aside from that, we should also expect improved support for AMD's Cezanne Desktop CPUs which are hinted to be introduced to the DIY segment at Computex 2021 next week.