Mac Pro Mojave with AMD RX580 need to fix ROM for boot screen.

I found a link to correct the problem that many people have but no one has completed with flashrom on Mac they e 580 from Mac Pro then insert to PC to use flash program,
I would like to try to do all on MAC usin flash rom. I was able to complete install brew then flashrom but now am overwelmened by manual
here is the link with fix
https://forums.macrumors.com/threads/turn-a-new-sapphire-rx580-pulse-into-th...

I need arguments to dump rx580 ROM to file 
copy to backup
edit changes
save file
flash rx580 card

What args should I use to dump to file and then flash

[Mike Banon]

Are you trying the internal flashing mode? If a Mac Pro chipset is not
supported by a flashrom, it wouldn't be successful.
You might need the external flashing: get a hardware programmer like
CH341A, find a ROM chip at RX 580 motherboard,
try to connect CH341A to a chip using some test clip which is
compatible with a chip (make sure this chip supports 3.3V
since there are some flash chips that are 1.8V), and try. This is how
I would have tried to do it.

On Fri, Aug 30, 2019 at 9:45 PM <[e-mail]> wrote:
> I found a link to correct the problem that many people have but no one has completed with flashrom on Mac they e 580 from Mac Pro then insert to PC to use flash program,
> I would like to try to do all on MAC usin flash rom. I was able to complete install brew then flashrom but now am overwelmened by manual
> here is the link with fix
> https://forums.macrumors.com/threads/turn-a-new-sapphire-rx580-pulse-into-th...
>
> I need arguments to dump rx580 ROM to file
> copy to backup
> edit changes
> save file
> flash rx580 card
>
> What args should I use to dump to file and then flash
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