Hi,
I'm trying to install either Tahoe 26.1 or 26.2, using a iMac20,1 and iMac20,2 config.plist that I've made - I've tried the following using both iMac20,1 and iMac20,2, using both Tahoe 26.1 and 26.2 installers, but with no luck
Hardware is:
MSI B450i Gaming AC Plus, 5700X, 16GB 3200, RX 6800.
Onboard Audio is disabled in the BIOS as I don't use it (just HDMI/DP out to the monitor and audio out to an amp)
Onboard Ethernet is disabled in the BIOS - I will use the onboard WiFi with Heliport/ITLWM.
I've mapped my USB ports freshly using USBToolBox, with 'Bind Companions' enabled and used 'Native Class Bindings' as per instructed in this video:
I've also tried without 'Bind Comapinions' enabled and with and without 'Native Class Bindings', but I don't really notice any difference, progress wise
Am I supposed to start with a USB Map file or UTB Map file, before converting with USBMapInjectorEdit, then pressing U?
I'm of the understanding this saves the changed automatically on the file?
I've got the latest OpenCore, and using the following up to date kexts, which are:
AppleMCEReporterDisabler
Lilu
UTBMap
VirtualSMC
WhateverGreen
ACPI:
SSDT-EC-USBX-DESKTOP.aml - I did try using SSDT-EC-DESKTOP.aml which worked fine in Sequoia 15.7.3 - but I have tried both to see if I was using the wrong one with Tahoe?
I have made sure to change the core count in all 4 places.
Drivers:
OpenHFSPlus renamed to HFSPlus
OpenRuntime
ResizeAppleGpuBars 0
ResizeGpuBars = -1
I am using -v keepsyms=1 debug=0x100 agdpmod=pikera as I have a RX 6800, should I remove agdpmod=pikera?
I've tried disabling SecureBoot in Security, and nothing changed
Does it matter that I have an NVME plugged in as well as a SATA drive?
The NVME usually needs a quirk (I think it's called that) enabled in config.plist to stop it showing as external, which I've tried applying, and again it made no difference in this process.
Do I need DevirtualiseMmio,SecureBoot enabled/disabled in the config.plist?
The installer halts on the following:
When trying with USB Native Class with NO companions, I get this:
Is there something obvious that I've missed?
I'm trying to install Tahoe 26.1 - Is this known to work or should I try 26.2?
Thanks

I'm trying to install either Tahoe 26.1 or 26.2, using a iMac20,1 and iMac20,2 config.plist that I've made - I've tried the following using both iMac20,1 and iMac20,2, using both Tahoe 26.1 and 26.2 installers, but with no luck

Hardware is:
MSI B450i Gaming AC Plus, 5700X, 16GB 3200, RX 6800.
Onboard Audio is disabled in the BIOS as I don't use it (just HDMI/DP out to the monitor and audio out to an amp)
Onboard Ethernet is disabled in the BIOS - I will use the onboard WiFi with Heliport/ITLWM.
I've mapped my USB ports freshly using USBToolBox, with 'Bind Companions' enabled and used 'Native Class Bindings' as per instructed in this video:
I've also tried without 'Bind Comapinions' enabled and with and without 'Native Class Bindings', but I don't really notice any difference, progress wise

Am I supposed to start with a USB Map file or UTB Map file, before converting with USBMapInjectorEdit, then pressing U?
I'm of the understanding this saves the changed automatically on the file?
I've got the latest OpenCore, and using the following up to date kexts, which are:
AppleMCEReporterDisabler
Lilu
UTBMap
VirtualSMC
WhateverGreen
ACPI:
SSDT-EC-USBX-DESKTOP.aml - I did try using SSDT-EC-DESKTOP.aml which worked fine in Sequoia 15.7.3 - but I have tried both to see if I was using the wrong one with Tahoe?
I have made sure to change the core count in all 4 places.
Drivers:
OpenHFSPlus renamed to HFSPlus
OpenRuntime
ResizeAppleGpuBars 0
ResizeGpuBars = -1
I am using -v keepsyms=1 debug=0x100 agdpmod=pikera as I have a RX 6800, should I remove agdpmod=pikera?
I've tried disabling SecureBoot in Security, and nothing changed

Does it matter that I have an NVME plugged in as well as a SATA drive?
The NVME usually needs a quirk (I think it's called that) enabled in config.plist to stop it showing as external, which I've tried applying, and again it made no difference in this process.
Do I need DevirtualiseMmio,SecureBoot enabled/disabled in the config.plist?
The installer halts on the following:
00:000 00:000 AAPL: #[EB.H.IS|!] Err(0xE) <- RT.GV boot-signature 7C436110-AB2A-4BBB-A880-FE41995C9F82
00:069 00:069 AAPL: #[EB.H.IS|!] Err(0xE) <- RT.GV boot-image-key 7C436110-AB2A-4BBB-A880-FE41995C9F82
00:134 00:065 AAPL: #[EB|H:IS] 0
00:198 00:064 AAPL: #[EB|LOG:INIT] 2026-01-07T04:32:10
00:262 00:064 AAPL: #[EB|VERSION] <"bootbase.efi 583~3330 (Official), built 2025-10-11T01:25:59-0700">
00:328 00:065 AAPL: #[EB|BUILD] <"BUILD-INFO[400]:{"DisplayName":"bootbase.efi","DisplayVersion":"583~3330","RecordUuid":"7F54D623-5B06-49A1-A558-0C78166E390F","BuildTime":"2025-10-11T01:25:59-0700","ProjectName":"efiboot","ProductName":"bootbase.efi","SourceVersion":"583","BuildVersion":"3330","BuildConfiguration":"Release","BuildType":"Official","Compiler":"clang-1700.4.4.1","SdkVersion":"26.1","SdkBuild":"25B66","TargetArchitectures":"x86_64"}">
00:392 00:064 AAPL: #[EB.CFG.DEV|!] Err(0xE) <- RT.GV booter-strict-xmlparser 7C436110-AB2A-4BBB-A880-FE41995C9F82
00:458 00:065 AAPL: #[EB|CFGEV] r5 0x0 0x0
00:523 00:064 AAPL: #[EB|H:IS] 0
00:599 00:075 AAPL: #[EB|WL:MODE] 0
00:662 00:063 AAPL: #[EB|CFG:ARG] boot-save-log 0x0000000000000002 (0x0000000000000002 < 0xFFFFFFFFFFFFFFFF) default
00:727 00:065 AAPL: #[EB|CFG:ARG] wake-save-log 0x0000000000000002 (0x0000000000000002 < 0x0000000000000002) default
00:792 00:064 AAPL: #[EB|CFG:ARG] console 0x0000000000000001 (0x0000000000000001 < 0x0000000000000001) default
00:856 00:064 AAPL: #[EB|CFG:ARG] serial 0x0000000000000001 (0x0000000000000001 < 0x0000000000000000) default
00:922 00:065 AAPL: #[EB|CFG:ARG] preoslog 0x0000000000000001 (0x0000000000000001 < 0xFFFFFFFFFFFFFFFF) default
00:986 00:064 AAPL: #[EB|CFG:ARG] timestamps 0x0000000000000000 (0x0000000000000000 < 0xFFFFFFFFFFFFFFFF) default
01:052 00:065 AAPL: #[EB|CFG:ARG] log-level 0x0000000000000001 (0x0000000000000001 & 0x0000000000000021) default
01:678 00:626 AAPL: #[EB|CFG:ARG] breakpoint 0x0000000000000000 (0x0000000000000000 & 0x0000000000000000) default
01:743 00:065 AAPL: #[EB|CFG:ARG] kc-read-size 0x0000000000100000 (0x0000000000100000 < 0xFFFFFFFFFFFFFFFF) default
01:807 00:064 AAPL: #[EB|CFG:ARG] force-error 0x0000000000000000 (0x0000000000000000 & 0x0000000000000000) default
01:873 00:065 AAPL: #[EB|H:IS] 0
01:937 00:064 AAPL: #[EB|WL] 0 0 0x01 0x01 0 0x00
02:011 00:073 AAPL: #[EB|BRD:NV] Mac-CFF7D910A743CAAF
02:076 00:064 AAPL: #[EB|B:VAw]
02:140 00:063 AAPL: #[EB|B:IAw]
02:205 00:065 AAPL: #[EB|WL] 0 0 0x01 0x01 2 0x00
02:269 00:063 AAPL: #[EB.BST.IDT|+]
02:335 00:066 AAPL: #[EB.BST.IDT|-]
02:399 00:063 AAPL: #[EB|WL] 0 0 0x01 0x01 3 0x00
02:464 00:065 AAPL: #[EB|WL] 0 0 0x01 0x01 4 0x00
02:528 00:063 AAPL: #[EB|BRD:NV] Mac-CFF7D910A743CAAF
02:593 00:065 AAPL: #[EB|WL] 0 0 0x01 0x01 5 0x00
02:666 00:072 AAPL: #[EB.H.CHK|BM] 0x0000000000000000
02:731 00:065 AAPL: #[EB.H.LV|!] Err(0xE) <- RT.GV boot-signature 7C436110-AB2A-4BBB-A880-FE41995C9F82
02:796 00:064 AAPL: #[EB|WL] 0 0 0x01 0x01 23 0x0E
02:861 00:065 AAPL: #[EB.H.LV|!] Err(0xE) <- RT.GV boot-image-key 7C436110-AB2A-4BBB-A880-FE41995C9F82
02:934 00:073 AAPL: #[EB|WL] 0 0 0x01 0x01 24 0x0E
02:999 00:065 AAPL: #[EB.H.LV|!] Err(0xE) <- RT.GV boot-image 7C436110-AB2A-4BBB-A880-FE41995C9F82
03:064 00:064 AAPL: #[EB.H.LV|!] Err(0xE) <- RT.SV- boot-signature 7C436110-AB2A-4BBB-A880-FE41995C9F82
03:129 00:065 AAPL: #[EB.H.LV|!] Err(0xE) <- RT.SV- boot-image-key 7C436110-AB2A-4BBB-A880-FE41995C9F82
03:194 00:064 AAPL: #[EB.H.LV|!] Err(0xE) <- RT.SV- boot-image 7C436110-AB2A-4BBB-A880-FE41995C9F82
03:259 00:065 AAPL: #[EB|H:NOT]
03:324 00:064 AAPL: #[EB|SB] 0x0
03:401 00:077 AAPL: #[EB|LIMGP] Acpi(PNP0A03,0)/Pci(1|3)/Pci(0|0)/Usb(9, 0)/HD(Part2,SigF48755A0-1907-4513-9AA3-34737B5100D9)
03:467 00:066 AAPL: #[EB|LIMG:FP] \System\Library\CoreServices\boot.efi
03:531 00:064 AAPL: #[EB|LIMG:OPT]
03:604 00:072 AAPL: #[EB|RPS] 0 0 0
03:669 00:065 AAPL: #[EB.OPT.LXF|F] <"\\System\\Library\\CoreServices\\com.apple.Boot.plist">
03:735 00:065 AAPL: #[EB.LD.LF|IN] 0 1 <"\\System\\Library\\CoreServices\\com.apple.Boot.plist"> <"0">
03:799 00:064 AAPL: #[EB.LD.OFS|OPEN!] Err(0xE) <"\\System\\Library\\CoreServices\\com.apple.Boot.plist">
03:873 00:074 AAPL: #[EB.OPT.LXF|LF!] Err(0xE)
03:938 00:064 AAPL: #[EB.OPT.LXF|F] <"Library\\Preferences\\SystemConfiguration\\com.apple.Boot.plist">
04:001 00:063 AAPL: #[EB.LD.LF|IN] 0 1 <"Library\\Preferences\\SystemConfiguration\\com.apple.Boot.plist"> <"0">
04:068 00:066 AAPL: #[EB|KF] <"root-dmg=file:///BaseSystem/BaseSystem.dmg">
04:131 00:063 AAPL: #[EB|MBA:CL] <"">
04:197 00:065 AAPL: #[EB|MBA:NV] <"-v keepsyms=1 debug=0x100 agdpmod=pikera slide=166">
04:261 00:063 AAPL: #[EB|MBA:KF] <"root-dmg=file:///BaseSystem/BaseSystem.dmg">
04:326 00:065 AAPL: #[EB|MBA:OUT] <"-v keepsyms=1 debug=0x100 agdpmod=pikera slide=166 root-dmg=file:///BaseSystem/BaseSystem.dmg">
04:390 00:063 AAPL: #[EB|LOG:VERBOSE] 2026-01-07T04:32:14
04:455 00:065 AAPL: #[EB.CSR.S|VAR] 0x00000040
04:527 00:072 AAPL: #[EB|OPT:BM] 0x82
04:593 00:065 AAPL: #[EB.OPT.LXF|F] <"\\System\\Library\\CoreServices\\PlatformSupport.plist">
04:657 00:064 AAPL: #[EB.LD.LF|IN] 0 1 <"\\System\\Library\\CoreServices\\PlatformSupport.plist"> <"0">
04:724 00:066 AAPL: #[EB|P:CPR] N
04:798 00:073 AAPL: #[EB|P:MPI] N
04:863 00:065 AAPL: #[EB|P:BPI] N
04:927 00:064 AAPL: #[EB.OPT.RKS|!] Err(0xE) <- BS.LocP EDB4A040-6D8A-11EC-8FAD-3E22FB93ADCF
04:993 00:065 AAPL: #[EB|KMR] 374165504
05:057 00:064 AAPL: #[EB.CS.CSKSD|+]
05:123 00:065 AAPL: #[EB.CS.CSKSD|!] Err(0xE) <- RT.GV boot-info-payload 8D63D4FE-BD3C-4AAD-881D-86FD974BC1DF
05:187 00:064 AAPL: #[EB.G.CS|-?] Ok(0)
05:253 00:066 AAPL: #[EB.LD.LF|IN] 0 1 <"<null string>"> <"1">
05:390 00:136 AAPL: #[EB.B.SBS|SZ] 723512
05:460 00:069 AAPL: #[EB|B:SHA] <54daf246d61ed64bd91fb5db0aaf3caee81661ff>
05:534 00:074 AAPL: #[EB.WL.PWLFNV|!] Err(0xE) <- RT.GV wake-failure 7C436110-AB2A-4BBB-A880-FE41995C9F82
05:598 00:063 AAPL: #[EB.WL.DT|!] Err(0xE) <- EB.WL.PWLFNV
05:664 00:066 AAPL: #[EB.WL.PWLFRTC|NONE]
05:729 00:064 AAPL: #[EB.WL.DT|!] Err(0xE) <- EB.WL.PWLFRTC
05:804 00:075 AAPL: #[EB.LD.LKC|D] <"System\Library\KernelCollections\BootKernelExtensions.kc.development">
05:870 00:066 AAPL: #[EB.LD.OFS|OPEN!] Err(0xE) <"System\\Library\\KernelCollections\\BootKernelExtensions.kc.development">
05:935 00:064 AAPL: #[EB.LD.LKC|R.2] <"System\Library\KernelCollections\BootKernelExtensions.kc">
12:825 06:889 AAPL: #[EB.LD.LKFS|-?] Ok(0)
12:889 00:064 AAPL: #[EB.LD.LKC|-?] Ok(0)
13:267 00:377 AAPL: #[EB|BST:REV1]
13:332 00:065 AAPL: #[EB|CSR:OUT] 0x00000040
13:397 00:065 AAPL: #[EB.BST.FBS|+]
13:462 00:065 AAPL: #[EB.BST.FBS|ADSZ] 0
13:526 00:064 AAPL: #[EB.BST.FBS|KSSZ] 0
13:593 00:066 AAPL: #[EB|SB:SBGMFNS] x86legacyap.im4m
13:657 00:064 AAPL: #[EB|RHF] usr\standalone\OS.dmg.root_hash
13:723 00:066 AAPL: #[EB|RH:MF] <"usr\\standalone\\OS.dmg.root_hash.x86legacyap.im4m">
13:788 00:064 AAPL: #[EB.LD.LF|IN] 0 1 <"usr\\standalone\\OS.dmg.root_hash"> <"0">
13:864 00:075 AAPL: #[EB.LD.OFS|OPEN!] Err(0xE) <"usr\\standalone\\OS.dmg.root_hash">
13:930 00:065 AAPL: #[EB.RH.LRH|P!] Err(0xE) <- EB.LD.LF
13:995 00:064 AAPL: #[EB.BST.FBS|!] Err(0xE) <- EB.RH.LRH
14:059 00:064 AAPL: #[EB|LOGT] 2026-01-07T04:32:23
14:126 00:066 AAPL: #[EB|LOG:EXITBS:START] 2026-01-07T04:32:23
When trying with USB Native Class with NO companions, I get this:
Is there something obvious that I've missed?
I'm trying to install Tahoe 26.1 - Is this known to work or should I try 26.2?
Thanks

Last edited:
EV] r5 0x0 0x0
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