Flash RX 580 to show boot screen

Hello all,

I was wondering if someone here could point me in the right direction.

I have a 2010 MacPro 5,1 running Mojave 10.14.3 and I installed a Radeon RX 580, the card works beautifully, except for one thing... I can't see the boot screen.

I know why this happens and I'm not surprised it doesn't. But I'm set on finding a way to flash this card so that it can show a boot screen and allow me to choose my boot disk as I need to run several OS's for work. I was hoping someone here knew of a tutorial or any resource I could go to so I can start my investigation on this endeavor? anything at all would be greatly appreciated.

Cheerio!

submitted by /u/wxsabi
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