Would that work if I have a second graphics card ?

If the Mac Pro 5,1 would let you boot from USB, this wouldn’t be an issue.  

> On Apr 1, 2020, at 3:55 AM, Eric Auer <e.a...@jpberlin.de> wrote:
> 
> 
> Hi RJ,
> 
> the short story is that VMWare creates a fully virtual
> computer. You can not install VMWare on Apple to use a
> DOS program to update the BIOS of your REAL VGA card.
> 
> You would have to run the BIOS update tool on real
> hardware. Maybe you can find an Apple tool for VGA
> BIOS updates? Or you could plug the card in a PC
> where you can boot DOS from USB stick or CD-ROM
> on the real hardware to run your update tool?
> 
> In theory, you can configure the commercial versions
> of VMWare to make the actual graphics card visible
> from the virtual computer, but then you have to stop
> using the graphics card on the host OS and I do not
> think you can run VMWare on your Mac while Mac OS is
> not allowed to use your graphics card. Maybe if you
> had TWO graphics cards and could tell Mac OS to not
> use the one which you want to update...
> 
> I think Mac OS has only newer-than-BIOS firmware, but
> it might be possible to load a CSM firmware extension
> to have PC BIOS compatibility and boot DOS on the Mac.
> But I have no idea whether that can actually be done?
> 
> Regards, Eric
> 
> 
> 
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