MP 1,1-5,1 Need some advice on Refind|OpenCore OS's High Sierra/Monterey/Windows 10

[AnimeFunTv]

So this is a bit confusing so I'll do my best.

I have several OS's I'd like to install on my cMP 5,1

The first two are to be run natively, Legacy Windows 10 on a Sata SSD & macOS 10.13 High Sierra on a PCIe-Dual NVME drive #2. Since I now have a boot screen on my flashed RX580. I can hold down the 'Option' key and switch between the two. Cool, No problem.

I do want to use macOS Monterey using OCLP (OpenCore Legacy Patcher); my initial test failed as I had Monterey installed on drive #1 on my PCIe-Dual NVME drive first, then installed 10.13 on drive #2. After some updates for 10.13 I attempted to boot into Monterey but it was no longer bootable, my data was still there, but it looks like the updates to 10.13 affected something with the EFI of OC as the icons had changed to High Sierra, I could load up the recovery for Monterey but I could not do anything else. Attempting to reinstall Monterey via Recovery would crash or take a long time to install (Est. 8hrs!)

I used Refind|OpenCore to help manage this but that software seems a bit complicated and not as easy as OCLP. Plus, I don't know if running OCLP UNDER Refind will cause unknown issues.

I was thinking of starting clean by Fresh installing Legacy Windows & 10.13 High Sierra first, applying all the updates to 10.13, then afterward installing OCLP on its own, no Refind.

My assumption is that 10.13 won't mess with OCLP since there aren't gonna be more updates to 10.13.

Any thoughts?

 

[sfalatko]

So this is a bit confusing so I'll do my best.

I have several OS's I'd like to install on my cMP 5,1

The first two are to be run natively, Legacy Windows 10 on a Sata SSD & macOS 10.13 High Sierra on a PCIe-Dual NVME drive #2. Since I now have a boot screen on my flashed RX580. I can hold down the 'Option' key and switch between the two. Cool, No problem.

I do want to use macOS Monterey using OCLP (OpenCore Legacy Patcher); my initial test failed as I had Monterey installed on drive #1 on my PCIe-Dual NVME drive first, then installed 10.13 on drive #2. After some updates for 10.13 I attempted to boot into Monterey but it was no longer bootable, my data was still there, but it looks like the updates to 10.13 affected something with the EFI of OC as the icons had changed to High Sierra, I could load up the recovery for Monterey but I could not do anything else. Attempting to reinstall Monterey via Recovery would crash or take a long time to install (Est. 8hrs!)

I used Refind|OpenCore to help manage this but that software seems a bit complicated and not as easy as OCLP. Plus, I don't know if running OCLP UNDER Refind will cause unknown issues.

I was thinking of starting clean by Fresh installing Legacy Windows & 10.13 High Sierra first, applying all the updates to 10.13, then afterward installing OCLP on its own, no Refind.

My assumption is that 10.13 won't mess with OCLP since there aren't gonna be more updates to 10.13.

Any thoughts?

To give you something else to think about since you have an EFI flashed GPU - you can install OC to a USB drive. When you use the Option key on boot you will see the native Apple boot menu with your High Sierra and Legacy Windows installs (plus any other bootable macOS installs - though Catalina, Big Sur, and Monterey won't boot from the native Apple Boot menu) as well as the USB drive. If you select the USB drive with OC you will then get the OC boot menu which allows you to boot any of the unsupported (on the cMP) versions of macOS.

This will isolate your OC EFI folder from your main machine so if you have any issues with OC booting you just pull the USB drive, boot to a natively supported macOS version, and fix your OC install.

I used to boot this way all the time until Big Sur/Monterey stopped supporting NVIDIA GPUs and I swapped my GTX 680 for a RX 560.

With prices coming down maybe I'll try to get a RX 580 and flash it....

Regards,
sfalatko

 

[AnimeFunTv]

To give you something else to think about since you have an EFI flashed GPU - you can install OC to a USB drive. When you use the Option key on boot you will see the native Apple boot menu with your High Sierra and Legacy Windows installs (plus any other bootable macOS installs - though Catalina, Big Sur, and Monterey won't boot from the native Apple Boot menu) as well as the USB drive. If you select the USB drive with OC you will then get the OC boot menu which allows you to boot any of the unsupported (on the cMP) versions of macOS.

This will isolate your OC EFI folder from your main machine so if you have any issues with OC booting you just pull the USB drive, boot to a natively supported macOS version, and fix your OC install.

I used to boot this way all the time until Big Sur/Monterey stopped supporting NVIDIA GPUs and I swapped my GTX 680 for a RX 560.

With prices coming down maybe I'll try to get a RX 580 and flash it....

Regards,
sfalatko

I was thinking the same thing but placing the OC EFI folder on a storage HDD in the 1st bay to keep it off the actual OS drives.

Prices have come down quite a bit and could get a great deal if you look. I bought one new full cost on amazon a few years ago, but just recently bought one used on eBay for $90 and locally! Practically brand new as there was not even a speck of dust on the fans. Bought the bios chips (took forever to ship from china) and the programmer and had it going in about an hour or two.