Specs
• CPU: Intel Core i9-10900K
• Motherboard: Gigabyte Z490 Vision D
• GPU: AMD Radeon RX 6900 XT (MBA)
• RAM: 32GB G.SKILL Ripjaws V DDR4-3200
• SSD (macOS target): Samsung 970 EVO Plus 1TB NVMe
• Wi-Fi/BT: Fenvi FV-T919
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Problem
Trying to boot the macOS 26 “Tahoe” installer via OpenCore 1.0.5 USB. I get into the OpenCore picker fine, select “Install macOS,” the Apple logo flashes for a split second, and then the machine instantly reboots.
No verbose logs, no panic screen — just Apple logo → reset.
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What I’ve Done So Far
BIOS:
• Above 4G Decoding enabled
• Resizable BAR disabled
• CFG-Lock (not visible in BIOS) → handled with quirks
• VT-d disabled
• Secure Boot / CSM disabled
• XHCI Hand-off enabled
• SATA Mode AHCI
• Intel RST disabled
• iGPU enabled, DVMT Pre-Alloc = 256MB
EFI (Kexts present):
• Lilu.kext
• VirtualSMC.kext
• WhateverGreen.kext
• AppleALC.kext
• IntelMausi.kext
• NVMeFix.kext
• USBInjectAll.kext (temporary)
• USBToolBox.kext
• EFI (Drivers present – to confirm):
• OpenRuntime.efi
• OpenCanopy.efi
• HfsPlus.efi (or OpenHfsPlus.efi)
Config.plist:
• Added kexts with ProperTree OC Snapshot (correct load order: Lilu → VirtualSMC → WEG → AppleALC → IntelMausi → NVMeFix → USBInjectAll → USBToolBox)
• SMBIOS set to iMac20,2 (since 10900K = 10 cores)
• NVRAM → boot-args: -v keepsyms=1 debug=0x100
Kernel → Quirks:
• AppleXcpmCfgLock = True
• AppleCpuPmCfgLock = True
• XhciPortLimit = True (temp for installer)
• Other standard quirks enabled (AvoidRuntimeDefrag, SetupVirtualMap, SyncRuntimePermissions, etc.)
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Stuck Point
• System resets instantly after the Apple logo, before any verbose logs or panic messages.
• I suspect either a driver issue (OpenRuntime.efi or HfsPlus.efi) or something SMBIOS-related, but I’ve checked the usual suspects.
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Question
• Has anyone with a Z490 Vision D + Comet Lake + Navi 21 (6900 XT) setup seen this instant reboot issue on Tahoe installer?
• Anything obvious I might have missed in BIOS or EFI config?
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