moving Gigabyte GA-Z270X-Gaming K7 from High Sierra to Ventura

[Patrick Ford]

I am trying to install macOS Ventura 13.7.x on the following Hackintosh system:

Hardware:

*
* Intel i7-7700K
* 64 GB DDR4
* AMD RX 6600 XT (used for Ventura install)
* NVIDIA GTX 1080 Ti (removed during Ventura installation attempts)
* OpenCore 1.0.7

Current SMBIOS:

* iMacPro1,1

Current Ventura EFI:

* Lilu
* WhateverGreen
* VirtualSMC
* AppleALC
* IntelMausi
* NVMeFix
* RestrictEvents
* USBToolBox + UTBMap
* SMCSuperIO
* SMCProcessor

SecureBootModel:

* Disabled

Boot args:
-v keepsyms=1 debug=0x100 alcid=7 agdpmod=pikera npci=0x3000

What I already fixed:

* Removed USBInjectAll.kext
* Removed NVIDIA boot args
* Stabilized SMBIOS
* Fixed missing PlatformInfo
* Cleaned up Ventura EFI
* Reset NVRAM repeatedly
* Fully erased target SSD multiple times (GUID/APFS)
* Removed GTX 1080 Ti during Ventura install attempts

Current behavior:

1. Ventura installer launches successfully from High Sierra.
2. Files copy successfully.
3. System reboots.
4. I boot the temporary “macOS Installer” entry using the cleaned Ventura EFI.
5. Installer fails with:

OS.dmg.root_hash
x86legacyap.im4m
Err(0xE)

Sometimes references:
\macOS Install Data\Locked Files\Boot Files\BootKernelExtensions.kc

I originally suspected EFI issues, but the EFI is now much cleaner and the earlier USBInjectAll fatal errors are gone.

Questions:

1. Does this now look more like installer media corruption / stale APFS installer state?
2. Has anyone seen x86legacyap.im4m on a standard Kaby Lake + RX 6600 XT setup?
3. Any Ventura-specific Booter quirks I should reconsider on Z270?
4. Should I remain on iMacPro1,1 or move to iMac19,1 at this stage?
5. Could High Sierra itself be too old to reliably create Ventura installer media?

Any suggestions appreciated.

EFI_Ventura_iMacPro1_1_SANITIZED_PUBLIC.zipEFI_Ventura_iMacPro1_1_SANITIZED_PUBLIC.zipEFI_Ventura_iMacPro1_1_SANITIZED_PUBLIC.zip

config.plist

[BALDY_MAN]

Your GPU AMD RX 6600XT Is supported in Tahoe os.

i have made a config. plist for you to try with the lastest tahoe os

delite evergreen kext from the EFI FOLDER, I have added the gpu id to config .plist

and change to hack id  to mac pro 7,1. , add  to the efi and download and run  config. plist in propertree

 

 

config.plist