Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Status
The first post of this thread is a WikiPost and can be edited by anyone with the appropiate permissions. Your edits will be public.
In your readme.txt, at the "Installation / update" section, you say:
For those who already have UEFI Windows installed, you may consider to install OpenCore onto the Windows drive's EFI partition. In order to do that, after mount the EFI partition, you should
1) rename the NO NAME partition to EFI
2) keep the Microsoft folder
3) replace the Boot folder
4) install the OC folder
So, now I have the OC installed in the EFI partition of another drive SATA (reloading the backup EFI folder with OC 0.6.6) and I can no longer see the Windows disk (icon) at startup (boot picker) of OC.
I can't figure out what I'm doing wrong!
Before I tried to do the OC update I could boot Windows and now, even having reinstalled the previous version, there is no longer a Windows icon so I can't boot it!
I ask you to please help me! Thank you!
The problem is, I also don’t know what you’ve done wrong.

We need to clarify a few things in order to solve the issue.

So, there is only one OC installed? And that’s 0.6.6 on the Windows drive EFI partiton?
 
The problem is, I also don’t know what you’ve done wrong.

We need to clarify a few things in order to solve the issue.

So, there is only one OC installed? And that’s 0.6.6 on the Windows drive EFI partiton?
Yes, only OC 0.6.6 is installed on an EFI partition of a SATA drive (not on the Windows drive).
I haven't checked yet if I can see the Windows volume as a startup disk from System Preferences.
 
The problem is, I also don’t know what you’ve done wrong.

We need to clarify a few things in order to solve the issue.

So, there is only one OC installed? And that’s 0.6.6 on the Windows drive EFI partiton?
I tried to select Windows volume in the startup disk but nothing, in the boot picker of OC there is not the Windows icon!
 

Attachments

  • Schermata 2021-03-06 alle 10.44.33.png
    Schermata 2021-03-06 alle 10.44.33.png
    38.1 KB · Views: 82
  • Schermata 2021-03-06 alle 10.47.58.png
    Schermata 2021-03-06 alle 10.47.58.png
    386.1 KB · Views: 79
  • Schermata 2021-03-06 alle 10.46.40.png
    Schermata 2021-03-06 alle 10.46.40.png
    36.5 KB · Views: 86
I tried to select Windows volume in the startup disk but nothing, in the boot picker of OC there is not the Windows icon!
As long as the Microsoft folder is untouched.

Please try re-install OC and BOOT folder to the Windows drive’s EFI partition. And bless it.
 
What will happen if you pull out all other drives but only leave the Windows drive in the cMP? (According to your previous posts. OC should be installed onto that EFI partition already)
 
What will happen if you pull out all other drives but only leave the Windows drive in the cMP? (According to your previous posts. OC should be installed onto that EFI partition already)
I pulled out all the drives leaving only the Windows drive but unfortunately, after the boot sound, only one of the two monitors appears in gray without boot picker (no icon)!
 
This sounds strange.

If it happen with your 0.6.6 backup. Which means not OC related.

So far, it points to your Windows is damaged.

Since you haven’t touch the Microsoft folder on the EFI partition. That means, very likely some system files on the main partition is damaged.

But if all you did was just replace the 0.6.6 files by 0.6.7, that shouldn’t happen.
 
This sounds strange.

If it happen with your 0.6.6 backup. Which means not OC related.

So far, it points to your Windows is damaged.

Since you haven’t touch the Microsoft folder on the EFI partition. That means, very likely some system files on the main partition is damaged.

But if all you did was just replace the 0.6.6 files by 0.6.7, that shouldn’t happen.
So the only solution is to do a clean new installation of Windows?
 
So the only solution is to do a clean new installation of Windows?
I don't think that's the only solution, but most likely the quickest way to fix this issue. Especially we don't know what's the root cause of the issue at this moment. It will take much more time to diagnosis than just re-install Windows (not necessary a clean one, you may able to keep your existing files /setup if you install Windows on your existing broken Windows).
 
I don't think that's the only solution, but most likely the quickest way to fix this issue. Especially we don't know what's the root cause of the issue at this moment. It will take much more time to diagnosis than just re-install Windows (not necessary a clean one, you may able to keep your existing files /setup if you install Windows on your existing broken Windows).
Thank you very much for your availability and for your patience and for your precious help!
But if I install on existing Windows, do I still have to follow all the steps described in APPENDIX of post # 1 of cdf?
Thanks in advance!
 
Hi again,

i have a little Problem with the Update to OC 0.6.7 (i think so, but i can't reveal it for 100%, perhaps AppleTV+ doesn't worked for me in the past too).

I want to use my Apple TV+ with my "new" 30"Apple Cinema Display and every time when i start a Film, it goes Fullscreen and instantly g back to normal view and doesn't start the film.

I have a GTX680 in my Mac Pro and use your Config (with the only change for activating my AirPort Card).

Is it not possible to view AppleTV+ with my Screen? I Thought, the DRM Fix is for this issue.

Many thanks for your work and stay healthy.

EDIT: okay, with Chrome it is working, but i thought the fix is for the AppleTV+ App in BigSur?
 
Last edited:
Hi again,

i have a little Problem with the Update to OC 0.6.7 (i think so, but i can't reveal it for 100%, perhaps AppleTV+ doesn't worked for me in the past too).

I want to use my Apple TV+ with my "new" 30"Apple Cinema Display and every time when i start a Film, it goes Fullscreen and instantly g back to normal view and doesn't start the film.

I have a GTX680 in my Mac Pro and use your Config (with the only change for activating my AirPort Card).

Is it not possible to view AppleTV+ with my Screen? I Thought, the DRM Fix is for this issue.

Many thanks for your work and stay healthy.

EDIT: okay, with Chrome it is working, but i thought the fix is for the AppleTV+ App in BigSur?
GTX680 can’t do hardware decode / DRM streaming.
 
  • Like
Reactions: SirVikon
Edited: I did not realize that I started at the opencore thread, opened Martin's link and wound up here, an entirely different thread. Glad I caught it before the grumpy thread police got all up in bunches.
 
Last edited:
Can someone direct me to the hex edit instructions for Mojave? I have a MacPro5,1 with a "MacVidCards" RX 580 and just want to enable hardware video codecs (H.264/H.265). I have no plans to upgrade to Crapalina.

(Yes I know there is search but this thread is huge and sometimes has information that is outdated on one page and updated on a later page. I don't want to use outdated instructions.)
 
Last edited:
Hi!

I updated to OC 0.67 and now Window will not start. I have windows 10 on a NVMe in slot 3. I tried to choose Windows as startup disk but got error "SDErrorDomain error 104"??
I will revert back to 0.66 to see if it works.

Doc
 
Can someone direct me to the hex edit instructions for Mojave? I have a MacPro5,1 with a "MacVidCards" RX 580 and just want to enable hardware video codecs (H.264/H.265). I have no plans to upgrade to Crapalina.

(Yes I know there is search but this thread is huge and sometimes has information that is outdated on one page and updated on a later page. I don't want to use outdated instructions.)
 
I wonder what are - if any - the benefits of using Board ID iMacPro1,1 versus Board ID Mac Pro7,1 for this particular OC package? I found one brief question/answer about this in the general OC thread that had to do with the 7,1 possible being more reliable for ports on some GPUs, but I wonder if anyone would not mind to share a bit more details of the pros/cons. Thanks!
 
  • Like
Reactions: Weisswurstsepp
I wonder what are - if any - the benefits of using Board ID iMacPro1,1 versus Board ID Mac Pro7,1 for this particular OC package? I found one brief question/answer about this in the general OC thread that had to do with the 7,1 possible being more reliable for ports on some GPUs, but I wonder if anyone would not mind to share a bit more details of the pros/cons. Thanks!
iMac Pro board ID works in Mojave, the 7,1 board ID does not.

Since this thread aim at provide HWAccel. Therefore, the package default to use the iMac Pro board ID, which can provide HWAccel on more macOS.
 
With gpu prices out of control day by day, what’s the cheapest way to get h264 encoding these days ?

I am not a gamer but I do need boot screens; so a flashed card w boot screen or open core and ???
 
Hi there, does anyone know if the open core package enables FileVault for the Mac Pro 5,1
 
iMac Pro board ID works in Mojave, the 7,1 board ID does not.

Since this thread aim at provide HWAccel. Therefore, the package default to use the iMac Pro board ID, which can provide HWAccel on more macOS.
Thanks for the clarification, Martin. I might try to test the 7,1 Board ID to check what appears to be a replicable bug in my system. In addition to loosing BT when I boot Big Sur right after Mojave (a known bug), I also loose the following:

1) Audio from one of the DP ports on the RX580 (I use the 2 DP ports and only one looses audio)
2) Sonnet Fusion Dual 2.5-inch SSD RAID on PCIe 4 does not load.

BT regularly comes back on a subsequent (second) Big Sur reboot as reported by other users, but the other two issues usually need a third Big Sur reboot to show up. At that point everything works perfectly, even if i shutdown/restart on a daily basis.

But in order to test the 7,1 Board ID to troubleshoot the above -- I would have to change the Board ID while booted on Mojave and just before rebooting into Big Sur... correct?
 
iMac Pro board ID works in Mojave, the 7,1 board ID does not.

Since this thread aim at provide HWAccel. Therefore, the package default to use the iMac Pro board ID, which can provide HWAccel on more macOS.
Going to sound dumb but does HWA in OC affect Windows 10 at all? Having instability with Windows (during gaming) and I'm trying to track down what it is, but I don't think so myself....
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.