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This can be done via OpenCore. This method fixed my Display Port Problem on Catalina on iMac 2011 with K1100M graphics card.

No worries. I have fixed my Display Port problem in Catalina by changing my iMac 2011 to iMac 2012 using OpenCore. However do bear in mind that there seemed to be a sleep problem for my set up - https://www.tonymacx86.com/threads/catalina-imac-2011-pretend-to-be-2012-panic-during-sleep.300341/

Hello, I wonder if you could help to explain what you meant by change a pic?

HI, Maybe try changing system model as per this post: https://www.tonymacx86.com/threads/mojave-to-catalina-displayport-not-working.284983/