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RX580

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just to let you know:
..............
iMac19,1 would be a better choice of smbios according to your hardware profile, or check over Headless Configuration:
Thank you Feartech,
after many attempts I was able to boot again in Catalina. I then changed the definition to iMac 19,1 so upgraded to Big Sur. Used OpenCore 0.6.3 for the installation. Everything went smooth with no troubles.
Bye
 
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