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Unless you know someone who knows how to debug UEFI BIOSes in depth (and specifically ASRock's) and also inject CPU microcodes, I would say that this is not within everyone's reach. And furthermore, knowing that the "pure" AM4 CPUs (non-G Ryzen series 1/2/3/5xxx) do not have integrated graphics in their IODs, this would require adapting an external graphics card by connection via one of the M.2 NVMe ports (in PCIe3.0 4x more, so very limited). Honestly, I think this is a voluntary limitation on the part of ASRock because there is no possibility of putting a dedicated graphics card in a "conventional" way.