I need to help with and install issue with Ryzen 9 9900x

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Katanoko1221

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AMD OS X Member
Apr 7, 2025
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Italy
CPU:
Ryzen 9 9900X
Hi everyone!!!
This is my first Ryzentosh build and i've the each problem; When i select "installMacOS" in OC boot menù, the install rest stuck after few second.
I attach EFI, System report and the boot-log containing the error.
I hope there is someone who can fix the efi so I can install macOS!!!

Thanks in advance 🙏🙏🙏

Pc configuration:
Cpu: Ryzen 9 9900x
Gpu: Amd Rx6600
Mbo: MSI x870 Gaming Plus
Ram: Crucial 64 Gb
NvMe: (M2) Crucial P3 plus.
 

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Well that complicates things lol So it is infact running the correct case,

Code: 
01:535 00:477 OCCPU: Entered AMD_CPU_EXT_FAMILY_1AH case

I'm assuming it just sits on the OpenCore screen with EXITBS etc? It doesn't enter the macOS kernel?
 
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Is it possible to see EFI folder @Katanoko1221 is using by now?
 
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Shaneee said:
Well that complicates things lol So it is infact running the correct case,

Code: 
01:535 00:477 OCCPU: Entered AMD_CPU_EXT_FAMILY_1AH case

I'm assuming it just sits on the OpenCore screen with EXITBS etc? It doesn't enter the macOS kernel?
Click to expand...
Wait a moment... There is a case that my "USB Key" have a issue about macOS DMG image.
I've formate it with rufus in "Fat 32" and after I've put inside this files downloaded with "macoOS recovery x".
Now i try to doing another usb with "TransMac" program!!!
 

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Shaneee said:
Well that complicates things lol So it is infact running the correct case,

Code: 
01:535 00:477 OCCPU: Entered AMD_CPU_EXT_FAMILY_1AH case

I'm assuming it just sits on the OpenCore screen with EXITBS etc? It doesn't enter the macOS kernel?
Click to expand...
I update you, the cpu family now is correct. Now the issue is after that i hit "macOS install" on "OC boot-menù" starting the verbose mode and after few second on the left of screen down below appear this message "OCB: StartImage falled - Aborted".
I've cheked the "usb key" and re downloaded Sequoia installer DMG and seems correct. At this point the thing it's a little bit weird and i wouldn't want that issue some uefi setting on mbo bios???

Many thanks to for their efforts 🙏
 
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Katanoko1221 said:
I update you, the cpu family now is correct. Now the issue is after that i hit "macOS install" on "OC boot-menù" starting the verbose mode and after few second on the left of screen down below appear this message "OCB: StartImage falled - Aborted".
I've cheked the "usb key" and re downloaded Sequoia installer DMG and seems correct. At this point the thing it's a little bit weird and i wouldn't want that issue some uefi setting on mbo bios???

Many thanks to for their efforts 🙏
Click to expand...
I dont know where your EFI come from
you had all mmio whitelist area on but DevirtulizeMMIO quirk disabled..other stuff are weird but unrelated to your problem.
if now you saw cpu correct in previous log try only to boot with this attached EFI
I updated some kext and activated sys report to see if your DSDT need patches (like many of us)
i disabled also resize bar and some kext
if system hangs post also a video (if you see some seconds of verbose debug line on your display)

 
Last edited:
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by the way, you are trying to install via recovery so you need a working ethernet /wifi connection to complete installation (when Shaneee will solve CPU family Opencore problem)
 
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@fabiosun that EFI file is unavailable. If you create an EFI for the user use the last one I uploaded for the debug logs and we'll see where it halts etc.
 
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ops sorry. i have problem to upload via attachement these days (i d k why
 
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fabiosun said:
I dont know where your EFI come from
you had all mmio whitelist area on but DevirtulizeMMIO quirk disabled..other stuff are weird but unrelated to your problem.
if now you saw cpu correct in previous log try only to boot with this attached EFI
I updated some kext and activated sys report to see if your DSDT need patches (like many of us)
i disabled also resize bar and some kext
if system hangs post also a video (if you see some seconds of verbose debug line on your display)

Click to expand...
The link for downloading the EFI that's you have set don't working, please postme the EFI here in a "file zip".
I've generated this EFI using "OC-Simplify", and this tool said me that my wifi-card and my ethernet card are not supported for macOS.
So, could be this the new issue that don't me proceede with the install?

Thank for your effort 🙏
 
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check easyupload link
in these days attachement here doesnt work and i dont know why
proble for instqallation is a second step to solve. Now is mandatory to see if opencore detect in a proper way your CPU after the great job done by Shaneee
 
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Now worked
 

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Katanoko1221 said:
Mbo: MSI x870 Gaming Plus
Click to expand...
if you have this one both ethernet and WIFI are unsupported for now
so i think you would need (when system starts to boot) of an Ethernet USB adapter
 
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Shaneee said:
@fabiosun that EFI file is unavailable. If you create an EFI for the user use the last one I uploaded for the debug logs and we'll see where it halts etc.
Click to expand...
I have an update, I tried to start the installation with the EFI that set me @fabiosun, I connected the PC to a USB Ethernet card, but it is also this time it did not enter the installer. I post the boot-log to see this new problem, but now the CPU family seems to be fine.
 

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Post a video to see if in debug there is some acpi errors
 
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Opencore problem for you cpu is solved i think
Now we have to refine better your efi
Try to disable from your bios
Wifi , ethernet and igpu
 
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Out of curiosity can you add these values under Kernel -> Emulate

Cpuid1Data = 10 0F 40 0B 00 00 00 00 00 00 00 00 00 00 00 00
Cpuid1Mask = FF FF FF FF 00 00 00 00 00 00 00 00 00 00 00 00
 
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