dosdude1: macOS Catalina post iMac GPU upgrade

[hhe_muc]

I am using and iMac11,3 (mid 2010) with Catalina (with dosdude1 setup). After upgrading my GPU from ATI Radeon HD 5750 1 GB to NVIDIA GTX 765M I only get a black screen after booting (even after a long time).

• The old ATI card works fine. Do I need to install High Sierra and install Catalina again?
• Is it possible to „patch“ the current setup?
• Or isn’t it possible at all?

Any help/hints appreciated!

Best regards,
Heiko

 

[LuisN]

I am using and iMac11,3 (mid 2010) with Catalina (with dosdude1 setup). After upgrading my GPU from ATI Radeon HD 5750 1 GB to NVIDIA GTX 765M I only get a black screen after booting (even after a long time).

• The old ATI card works fine. Do I need to install High Sierra and install Catalina again?
• Is it possible to „patch“ the current setup?
• Or isn’t it possible at all?

Any help/hints appreciated!

Best regards,
Heiko

Reinstall over current without patching video. Patches video kexts don't work with supported cards

 

[hhe_muc]

Reinstall over current without patching video. Patches video kexts don't work with supported cards

Hi Luis,

Thank you for your swift reply! According to my understanding, the patches are applied automatically during the installation process.

Wouldn't it be possible to select "macOS Post Install" and then deselect "Legacy Video Card Patch" and activate "Force Cache Rebuild" and therefore "Change" the current setup?

Looking forward for your rating...

Best regards,
Heiko

 

[LuisN]

Hi Luis,

Thank you for your swift reply! According to my understanding, the patches are applied automatically during the installation process.

Wouldn't it be possible to select "macOS Post Install" and then deselect "Legacy Video Card Patch" and activate "Force Cache Rebuild" and therefore "Change" the current setup?

Looking forward for your rating...

Best regards,
Heiko

When creating your usb patcher you can deselect the option to apply the patches automatically and/or APFS patch.It's under the options menu but I'm not sure, just find it and deselect that option. After installing you need to boot with the usb patcher and apply all the relevant patches for your model except the video one.

 

[hhe_muc]

When creating your usb patcher you can deselect the option to apply the patches automatically and/or APFS patch.It's under the options menu but I'm not sure, just find it and deselect that option. After installing you need to boot with the usb patcher and apply all the relevant patches for your model except the video one.

View attachment 889571

Hi Luis,

Thank you for your hints!

I deselected the auto-apply option and re-created a new usb image for Catalina setup. In order to do this I needed to switch graphics cards and afterwards I was able to re-install High Sierra (with Nvidia GPU - see screenshot below) and setup two APFS volumes: one for High Sierra and one for Catalina.

As it is not possible to set the start volume to the Catalina installer or choose the boot device via the option key: Do I need to switch graphic cards again to reinstall Catalina? Or is there another trick to boot from my usb stick?

Best regards,
Heiko

 

[LuisN]

Hi Luis,

Thank you for your hints!

I deselected the auto-apply option and re-created a new usb image for Catalina setup. In order to do this I needed to switch graphics cards and afterwards I was able to re-install High Sierra (with Nvidia GPU - see screenshot below) and setup two APFS volumes: one for High Sierra and one for Catalina.

View attachment 889977

As it is not possible to set the start volume to the Catalina installer or choose the boot device via the option key: Do I need to switch graphic cards again to reinstall Catalina? Or is there another trick to boot from my usb stick?

Best regards,
Heiko

Yes, that's the best solution since you have disabled the auto patcher. Switch graphic card and apply the relevant patches for your model except the video ones

 

[Luis Mimi Berrios]

Hi! Im having the same issue. Did you resolve it?

Thanks and regards

 

[hhe_muc]

Hi! Im having the same issue. Did you resolve it?

Thanks and regards

No - but if I find some time I will try out getting the Bootswitcher and Bootscreen back on a Nvidia card via nvflash.

Link:

iMac 2009 to 2011 (A1311/A1312) Upgrade Guide – MacintoshMen

macintoshmen.is-great.net

 

[Luis Mimi Berrios]

No - but if I find some time I will try out getting the Bootswitcher and Bootscreen back on a Nvidia card via nvflash.

Link:

iMac 2009 to 2011 (A1311/A1312) Upgrade Guide – MacintoshMen

macintoshmen.is-great.net

Thanks for the link. I dont have the original gpu since it was defective. I will install team viewer and connect to the machine using another computer to try to flash card. Will let you know.

 

[Luis Mimi Berrios]

I got boot screen with the flashed card! Thank you so much for the link!

 

[bone1]

Luis eu consegui conforme o link abaixo

Abraço


Hi, here is a resume of the information about swap GPU on this iMacs

2011 iMac Graphics Card Upgrade

iMac 2009 to 2011 MXM3 graphics card upgrade (Lastest update 10/13/2023 - this is the official documentation page - you found it finally!) This is the single and only documentation post. During the last years we constantly updated this post to reflect the lastet development of vBIOS and OCLP...

forums.macrumors.com

I upgrade my iMac 2010 with a new GPU K1100 and had de same problem, I fix it flashing the new card using ssh from another computer following the @xanderon post.

2011 iMac Graphics Card Upgrade

so guys, I have a little gift for you to give back after such an incredible thread :D hope you like it, the headaches to get it running were immens for me as a newb. I couldn't stand it to use fckin windows to flash the cards and so I prepared this ~350mb drive I created a Linux Live USB...

forums.macrumors.com

Best Regards

 

[bone1]

and this

2011 iMac Graphics Card Upgrade

EDIT: 8/16/20 NEW AGC kexts have been added to change "board-id" to "board-ix" in the AppleGraphicsDevicePolicy binary. This has the same affect as "agdpmod=pikera" from Whatevergreen, this upload is for AMD users. "instant on" K3100m/k4100m/k5100m/780m etc cards need this kext to fix...

forums.macrumors.com

 

[ggwwzz11]

Hi Luis,

Thank you for your hints!

I deselected the auto-apply option and re-created a new usb image for Catalina setup. In order to do this I needed to switch graphics cards and afterwards I was able to re-install High Sierra (with Nvidia GPU - see screenshot below) and setup two APFS volumes: one for High Sierra and one for Catalina.

View attachment 889977

As it is not possible to set the start volume to the Catalina installer or choose the boot device via the option key: Do I need to switch graphic cards again to reinstall Catalina? Or is there another trick to boot from my usb stick?

Best regards,
Heiko

Hi, Heiko. I'm having the same problem. Instead I have a flashed GTX770M card.
But I still have black screen during startup (unless I press option or do Nvram reset) and have display visual after I enter my login password. As well as black screen after entered sleep mode.
I have tried both auto and manual patch options while install dosdude1's patcher.
Can't get WIFI working on Catalina. So settled in Mojave that works pretty OK except really annoying black screen issue.
And I did deselect the Legacy video card while post install phase. But the black screen issue still unresolved.