Verified working with macOS version 11.2.1(20D74) Big Sur and OpenCore 0.6.6.
After you fully installation, remember to use Opencore Configurator to change your Platform Info, and choose iMac 19,1.
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Motherboard: ASRock Z390M-ITX/ac
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CPU: Intel® Core™ i7-9700K Processor
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iGPU: Intel® Core™ UHD Graphics 630
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dGPU: Dell AMD Radeon RX580 8G 2304SP
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WiFi/Bluetooth: BCM94360CS2
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Primary Graphics Adapter -> PCI Express
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CFG Lock -> Disable
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IGPU Multi-Monitor -> Enabled (To enable iGPU hardware boost)
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XHCI Hand-off -> Enabled
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Secure Boot -> Disabled
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CSM -> Disabled
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Above 4G Decoding -> Disabled
- CPU Turbo
- Sleep/Awake
- iGPU Boost
- Wi-Fi/Bluetooth & Dual Network Card
- USB Port(With USBMap.kext)
- NVRAM
- SideCar
- AirDrop
- iMessage/FaceTime(After you changing the Platform Info)