Start Mac Pro version 4.1 to 5.1 without using the EFI GPU.
Start Mac Pro version 4.1 to 5.1 without using the EFI GPU.
Starting the system with my GT 120 and RX 580 functions properly, but I can access MacOS. When I removed the GT 120 to try installing macOS Mojave, it refused because the GPU wasn’t recognized—even though it was a non-metal card. My display is connected to the RX 580, yet updating firmware with the installer isn’t working due to this issue. The system won’t boot without the GT 120, and even pressing power doesn’t trigger any response. I’m trying to install OpenCore and need the Mojave update, but it’s stuck. Any suggestions on how to proceed?