Can I run High Sierra on my new iMac 20,1 and how to install it?
I have High Sierra and all my data on an external TimeMachine HDD, attached to the iMac27.
When using Command R after PWR on, is says the system (Big Sur) doesn't support this.
iMac 27″, macOS 10.13
As Eau Rouge stated, you cannot install/run High Sierra on an iMac20,1. You can only create a VM (Virtual Machine).
No you cannot install High Sierra on your mac.
Macs cannot downgrade to an older OS than the one it comes preinstalled with.
Your mac came with Big Sur installed so you cannot run any of the older OS's.
New macs with the silicon chip have a different protocol to boot ing to the Recovery HD.
Hold and press your power button until you see Loading startup options,
Use macOS Recovery on a Mac with Apple silicon - Apple Support
helmut22 wrote:
Can I run High Sierra on my new iMac 20,1 and how to install it?
FWIW, if you have an older Mac or access to one, you could download the High Sierra installer, copy it to your new iMac, then create a High Sierra VM in VMWare Fusion or Parallels Desktop.
helmut22 wrote:
I do have an older Mac and I will have to learn how to do this.
That would be your only option. You should be aware, there are certain limitations to VMs. Not all software will run correctly. For instance No VMs will support accelerated graphics.
Eau Rouge wrote:
New macs with the silicon chip have a different protocol to boot ing to the Recovery HD.
Hold and press your power button until you see Loading startup options,
Use macOS Recovery on a Mac with Apple silicon - Apple Support
There are no Apple silicon iMacs as yet.
I was able to recover all my data from an older Mac. But the operating system remains Big Sur. Much of my application software does not run on Big Sur. The original OS High Sierra is also available on the recovery disk. I would like to know how to replace Big Sur with the High Sierra on the Recovery HD with a few key strokes if possible.
Is there not, then oopsy, so why can't he get to his Recovery HD.
I think the user meant he couldn't use Recovery Mode to install High Sierra, not that they couldn't get into Recovery Mode.
Correct
I do have an older Mac and I will have to learn how to do this.
Can I run High Sierra on my new iMac 20,1?
