OpenCore EFI folder for the Gigabyte Z490 Vision G motherboard, built and maintained since September 2020. The configuration is build based on Dortania’s OpenCore Install Guide and improved by analysis of the OpenCore debug boot log and the .ioreg file from a real iMac20,1. USB ports are mapped via ACPI, so no USB kext is required. It also support SATA Hotplug (needs to be enabled per SATA port in UEFI Settings).

Before you start:

• Use the latest BIOS version (F24a)
• macOS Tahoe (26.x): AMD Polaris GPUs require disabling WhateverGreen during install. Re-enable after installation.
• macOS 14.4+: Disable SecureBootModel if upgrading from 14.3.1 causes kernel panic (details)
• NVIDIA Kepler GPUs: Require root patching with OpenCore Legacy Patcher in macOS 12+

1. Download the latest EFI from Releases
2. Extract and review the included Changelog.md
3. Open config.plist with OCAT or ProperTree

Navigate to PlatformInfo/Generic, and generate SMBIOS Ddta. Fill in:

• Model: iMac20,2 (i9) or iMac20,1 (i5/i7)
• Serial Number
• MLB (Board Serial)
• ROM
• UUID

If using a different CPU:

• Disable CPUFriend.kext and CPUFriendDataProvider.kext initially
• Generate your own after installation (see Post-Install section) with CPUFriendFriend

If using NVIDIA Kepler GPU (GTX 600/700):

• Change Misc/Security/SecureBootModel to Disabled
• Enable RestrictEvents.kext
• Change csr-active-config to 03080000

If your BIOS doesn't support CFG Lock disable:

• Enable Kernel/Quirks/AppleXcpmCfgLock

If not dual-booting Windows:

• You can disable Kernel/Quirks/CustomSMBIOSGuid

Required settings:

*Enable Re-Size BAR if your GPU supports it and set Booter/Quirks/ResizeAppleGpuBars to 0

From macOS: Download from App Store, OpenCore Legacy Patcher, or ANYmacOS

From Windows/Linux: Follow Dortania's guide

1. Copy EFI folder to a FAT32 USB drive
2. Reboot and perform NVRAM reset (press Space in boot menu)
3. Boot from USB
4. If successful, copy EFI to your drive's ESP partition

Once macOS is running, enhance security:

SecureBootModel: j185f (iMac20,2) or j185 (iMac20,1)
csr-active-config: 00000000 (enables SIP)

Update UEFI/APFS MinDate/MinVersion to match your macOS version (reference)

Generate a custom CPUFriendDataProvider.kext:

1. Download CPUFriendFriend
2. Run and follow prompts to generate the kext
3. Replace existing CPUFriendDataProvider.kext
4. Enable both CPUFriend.kext and CPUFriendDataProvider.kext

Full guide: CPU Power Management

Calculate ScanPolicy to control boot menu items using this generator

Change theme in Misc/Boot/PickerVariant:

• HJebbour\GoldenGateExt (New default theme with 144 Icons)
• Blackosx\BsxM1 (mac M1 style)

• SSDT-AWAC-ARTC — Enables RTC clock
• SSDT-EC — Fake embedded controller
• SSDT-PLUG — CPU power management (not needed for macOS 12+)
• SSDT-XHUB — USB port mapping via ACPI
• SSDT-USBX — USB power properties
• DMAR (optional) — For VT-d compatibility with certain Wifi/BT cards

• VirtualSMC + sensors — SMC emulation
• Lilu — Patching engine
• WhateverGreen — Graphics patches
• AppleALC — Audio (slimmed to layout 17 only)
• AppleIGC — Intel I225-V ethernet
• CPUFriend + DataProvider — CPU power management (disabled by default)
• RestrictEvents — Addresses RAM warnings and fixes OTA updates (disabled by default)
• iBridged.kext – New kext which enables proper OTA updates when using SMBIOS from T2 Macs

To use Intel UHD 630 for driving displays:

1. Enable the framebuffer in DeviceProperties
2. Delete the # from #PciRoot(0x0)/Pci(0x2,0x0)
3. Disable the headless framebuffer entry

For better AMD GPU performance:

1. Switch SMBIOS to iMacPro1,1 or MacPro7,1
2. Apply required config edits
3. Regenerate CPUFriendDataProvider for new SMBIOS
4. Disable headless iGPU framebuffer

For macOS 12+:

1. Set SecureBootModel to Disabled
2. Enable RestrictEvents.kext
3. Set csr-active-config to 03080000
4. Install drivers using OpenCore Legacy Patcher

View full Geekbench results

Boot failure with black screen:

• Check SecureBootModel setting
• Verify BIOS settings (especially CSM disabled)
• Test with -v boot argument for verbose mode

No ethernet connection:

• Ensure AppleIGC.kext is enabled
• Check DisableIoMapperMapping quirk is enabled
• For macOS Catalina, enable the I225-V device-id spoof

No audio:

• Check selected Audio Devices in System Settings
• Verify Layout-id is 17 in DeviceProperties
• Check AppleALC.kext is enabled
• For Tahoe, apply OCLP audio patch

USB issues:

• SSDT-XHUB handles all USB mapping
• No additional kexts needed
• See USB port list for details

• OpenCore Install Guide (Dortania)
• OC-Little Translated (ACPI hotpatches)
• Intel 400 Series Chipset Documentation
• System Update Workarounds

• Acidanthera — OpenCore and kexts
• Dortania — OpenCore guides and OCLP
• Corpnewt — ProperTree, SSDTTime, CPUFriendFriend
• daliansky — OC-Little collection
• SL-Soft — Kext Updater and ANYmacOS

This configuration is provided as-is. Always backup your data before installation. Hackintosh systems are not officially supported by Apple and may have compatibility issues.