OpenCore 0.6.0 for Big Sur

OpenCore 0.6.0 Experimental Built (6/27/2020@12:53PM ET)

Asus Prime Z390-A Experimental Configuration (Only for Big Sur):

Serial Number, MLB…. etc had been removed from config file.

BIOS settings are same as last post. This configuration may not be able to boot the Installer. Probably due to the 2 newly added items in the NVRAM section. But it will boot an installed Big Sur partition just fine.

But the installer shouldn’t be boot anyway, since it had some kind of dead loop issue. I installed the OS on an USB SSD with a real Mac and moved it over to the Desktop.

If you still want to try booting the installer, you may try out changing the config file with some of the settings below.

(Make sure to clean NVRAM first!)

Known Issue:

DRM not working: Can’t play Netflix/ AppleTV+


Opencore 0.5.9

Since Clover BootLoader is reaching its end of life, it’s time to switch to OpenCore BootLoader.

This is the last version of Clover I used on my desktop.


    • Motherboard: ASUS Prime Z390-A (BIOS Release Date: 2020/05/04 Version: 1502)
    • CPU: Intel Core i9 9900K
    • Memory: 2 * Corsair Vengeance LPX 16GB 3200Mhz
    • GPU: MSI Radeon RX 5700 XT Gaming X
    • SSD: Western Digital WD Black SN750 500GB
    • Wireless: Fenvi FV T919

BIOS Configuration

Ai Tweaker

    • Ai Overclock Tuner: XMP II

    • ASUS MultiCore Enhancement: Enabled – Remove All limits

    • DRAM Frequency: DDR4-2933Mhz

      I have stability issues (display halt) if I run at memory’s default 3200Mhz

      This is probably due to BCLK/DRAM multiplier, the real iMac 19,1 runs its memory at 2666Mhz , which means multiplier was set to 100:133. I found a comment saying “some platforms do not like high memory multipliers”, but I need to test it out.

    • DRAM Voltage: 1.30000 [Unnecessary RAM tweeking]


Platform Misc Configuration

    • PCI Express Native Power Management: Enabled

    • Native ASPM: Enabled


    • Software Guard Extensions (SGX): Disabled

    • Intel (VMX) Virtualization Technology: Enabled

      CPU – Power Management Control

      • Boot performance mode: Turbo Performance

      • Turbo Mode: Enabled

      • CFG Lock: Disabled

System Agent (SA) Configuration

    • VT-d: Disabled

    • Above 4G Decoding: Enabled

      Graphics Configuration

      • Primary Display: PCIE

      • iGPU Multi-Monitor: Enabled

      • DVMT Pre-Allocated: 64M

PCH Configuration

PCI Express Configuration -> PCIe Speed: Gen3 [This probably doesn’t do anything]

PCH Storage Configuration

    • SATA Controller(s): Disabled [I don’t use any SATA Drives]

Onboard Devices Configuration

    • PCIEX16_3 Bandwidth: X4 Mode [I have my SSD installed on that port]

      Serial Port Configuration

      • Serial Port: OFF

USB Configuration

    • Legacy USB Support: Disabled

    • XHCI Hand-off: Enabled


Boot Configuration

    • Fast Boot: Disabled

Secure Boot

    • OS Type: Windows UEFI Mode

USB Ports

By using Hackintool, I selected 15 USB ports that I needed and blocked the rest of them. You probably need different configuration to make your setup works (either reconfigurate or avoid using ports that are blocked).

  • Green: Ports that works
  • Red: Ports that won’t work


  • Some devices that are not being supported on macOS will cause problems. For example, my Oculus Rift S (which doesn’t have software support under macOS) causes instant wakeup, the solution is to plug it into one of the ports that are blocked, so it won’t even show up under IORegistryExplorer.

  • The configuration was set to use discrete graphics, so the onboards video output won’t work.


  • I used the bottom connector from USB1112 for Bluetooth connection integraded to my wireless card (Fenvi T919). USB_E12 and USB_E34 was connected internally via a USB 2.0 Hub, not only makes the USB device tree looks messy, but also brings some chances of not being able to discover Bluetooth hardware if the Bluetooth USB is connected to one of them.

  • Although I blocked USB_E12 and USB_E34 in the configuration, they are still useful for connecting devices that works on Windows but not needed for macOS, like AIO water pump and RGB controller.

  • My case doesn’t have a front USB-C connector, so the U31G1_C5 is blocked.

EFI File !!! Fill in SMBIOS informations before use.