![]() ![]() As you can see in my list of partitions, I have three EFI on other disks because they previously housed some macOS, but with the purchase of the SSD they became storage and I never knew how to delete them. To make sure I checked the date and time of the files. I installed EFI for Mac Pro 5.1 on the disk0s1 partition. I attach the screenshot of my partitions*. Both High Sierra and the old Monterey still have the forbidden symbol when trying to start them. In bootpicker, only the newly installed Monterey and Windows 10 start. ![]() Once in Finder I downloaded OCLP and was able to create and install the correct EFI for the Mac Pro 5.1.īut a problem remains. To my surprise, after the installation restarts the entire process was carried out without problems. I thought that not having a correct EFI it would not start at the boot point. I made a third container on SSD#1 and installed Monterey on it. Last night after writing the query here, I thought I would do a test. Thank you very much for your detailed explanation. Maybe the wrong OpenCore Legacy Patch needs other steps to get reverted and there might be other MR members that can help you with that. Windows or Linux might work as well to do the setup, but I´ve never tried that.Īfter that, try to install macOS again by the suggested methods. Alternatively you can deinstall the drive an attach it directly to another Mac. Then attach the MP with a Thunderbolt cable to the working Mac. To attach the SSD#1 drive to another Mac, boot the MP in Target Disc Mode while pressing the 'T' key. There are several Github pages that host them. ![]() If you don´t have access to the right EFI, google for it. Be cautious to take the right partition from the diskutil list command, especially when working from another functioning Mac or you can end up with two corrupted Macs. With /dev/disk0s1 it´s the same, that it can differ on your system. ~/Documents/MyEFIimageFile.dmg or something else. In the commands above efi.binary means the full path to the DiscImage containing the EFI, this can be different for you, e.g. $ sudo dd if=/dev/disk0s1 of=efi.binary bs=409600 # Backup EFI partition to EFI disk image (efi.binary): ![]()
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