Markus formatted a 4GB USB stick to FAT32 (not exFAT or NTFS). He downloaded the latest verified ROM: B460H6_EM_P11v2.3_CAP (December 2022), which patched the "USB Wake" bug and added Resizable BAR for his GPU.
Unlike retail motherboards, the Medion B460H6-EM Medion B460h6-em Bios Update