Istload384

1. Install Lion On Unsupported Mac Os
2. Install Mojave On Unsupported Mac
3. Install Os X Mountain Lion On Old Unsupported Macs

Then follow this procedure: Put the unsupported Mac in Target Disk mode and plug it into a Lion supported Mac. Run the Lion installer and make sure to choose your unsupported Mac's hard drive. Let the install finish. Boot back into the supported Mac's OS, and put the unsupported Mac back to target disk mode.

However, with a clever workaround, some of the older, unsupported Macs can be made to run Apple’s OS X Mountain Lion after all! Special software and installation instructions have been posted in the Macrumors.com forum by “hackerwayne” with step-by-step instructions to help many unsupported Macs run OS X Mountain Lion. We need to download micropatcher from GitHub. ( MicroPatcher Download ) 2. Plug your boot-able MacOS Monterey USB Drive into the computer. Open up mac terminal and type sudo. Open up the micropatcher folder and drag and drop the ( Install-SetVars.sh ) file into the terminal and then you need to drag and drop the ( USB with Monterey.

I know this is not a common scenario, but for the few people that upgraded a Mac originally equipped with a Core Duo processor to a Core 2 Duo processor, here is the procedure. I have an iMac version 4,1 that I upgraded years ago, and it worked. The person who found the solution had an upgraded Mac Mini. You will need a second computer that is Lion capable for this tip to work.

Install Lion On Unsupported Mac Os

Install Mojave On Unsupported Mac

As always, Make sure you have a backup of the original install! This worked for me, but always be prepared for the worst.
I made, and used, a Lion Mac OS X Install ESD on a thumb drive. Instructions to make one can be found all over the Mac centric web sites. Then follow this procedure:

• Put the unsupported Mac in Target Disk mode and plug it into a Lion supported Mac.
• Run the Lion installer and make sure to choose your unsupported Mac's hard drive. Let the install finish.
• Boot back into the supported Mac's OS, and put the unsupported Mac back to target disk mode.
• Delete the PlatformSupport.plist at /System/Library/CoreServices on the unsupported Mac's hard drive.
• Reboot the Unsupported Mac and it should boot into Lion normally.

[crarko adds:

Install Os X Mountain Lion On Old Unsupported Macs

I don't have the equipment to try this, but it seems plausible. As recommended in the hint, have a complete system backup handy in case something goes awry.]