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Hello, for information: no succes with Mojave install with the AFPS change and macpro6. 1 smbios. The same issue after boot, Apple logo and grey screen. Good Luck for your work! Have à nice day!

Hello dear Edhawk, Thank you for the explaination of smbios. I know for printer driver in System Preferences, but for my Panasonic Pro model doesn't work because he tell me a number of fax before printing! Only the scaner work. The argument boot command: "agdpmod=ignore" doesn't work, it's...

@ Edhawk, Maybe changing the smbios is also a solution "imac? xxx", I did some tests without good result. Another thing, I have a lazer pro printer and panasonic doesn't provide 64 bits drivers anymore. Do you have an EFI for the same system and for Mojave in your drawers?

Hello Edhawk, Sorry for my late reply. The argument boot command: "agdpmod=ignore" doesn't work, it's almost worse because I don't even see the Apple logo before the black screen. I have done a lot of research and testing. I came to the conclusion that the problem is the acceleration of the...

Hello, Radeon rx 570. Are you sure you EFI opencore 0.83 work with Monterey 12.6.1. I try to find the solution of the black screen just before the login window, I find nothing.

Hello, I have the same problem as you, have you found a solution? My graphics card Radeon Rx 570 and you, witch do you have? What version of Monterey do you have installed? For my part Monterey 12.6.1 Thank you in advance for your reply.

Monterey is installed but I can't reach the login window. I placed the EFI folder in sz partition Monterey. The problem remains the same as with the EFI of the bootable usb key

I managed to install Monterey by starting the installation from app store update and continued until the migration of my data. The problem is during the loading progress with the Apple logo, when switching to the video driver, the screen becomes black with a bar that appears with the mouse...

Thank you again for being there for me. I only waited 2 minutes because the first time the Monterey menu appeared immediately. So I will try with more patience. You don't think there is a problem with nvram/prev-lang:kbd/data

What is strange is that at the first attempt to boot with your efi, I arrived at the Monterey installation window. After I made my backups of Big Sur. I decide to do the installation, I have not changed anything in the EFI and this gray screen appears after the apple logo, only the mouse...

I send you my total hardware with EFI folder in my first message. My graphics card is radeon rx 570,native card on macOS. I hope you will find the solution! Thank's

Hello, thank you for Your message and help. I installed your efi and change Hello Edhawk, Thank you for your message and help. I used your EFI and change the SMBIOS to MacPro7.1. It worked on the first boot but I did not install. I did all my backups and disk clones first. Then I wanted to...

Hello Edhawk, I tried a clean install of monterey last update with your EFI without success, I get a black boot scream. I am currently running Big Sur 11.7 1. My initial installation of big 11.6.7 was done in online mode with base system on usb key then upgrade to 11.7.1. I used your EFI 2...