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Bios modding


I started using HiveOS because my Windows were crashing 2 times a day.
My problem with HiveOS is that it seems I am unable to undervolt RX 570 GPUs (showing 90W in software = 150W of the wall), I can put 700mV or 1000mV, it doesn’t make a difference. Also limiting the power target does nothing. Overclocking works just fine. Aggressive undervolting crashes the rig at any voltage level.
In windows I had to patch the drivers with atikmdag patcher.
When starting the rig I get these errors on all modded cards: [drm:amdgpu_get_bios [amdgpu]] *ERROR* ACPI VFCT table present but broken (too short #2).

Do I have to revert all bioses to default (and lose additional performance) or is there another way to fix this?
Thanks in advance for any help.