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10.7: Install Lion on an unsupported Mac with an upgraded processor System 10.7
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.

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: 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.]
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10.7: Install Lion on an unsupported Mac with an upgraded processor
Authored by: BiL Castine on Aug 05, '11 10:37:58AM

it might be a good idea to test this method without overwriting your existing OS. follow the instructions above, except do the install on an external (FireWire or USB) drive, then try to boot the unsupported Mac from that drive. if all goes well, you can either start over with the internal drive or use the Migration Assistant to move your system to the external drive then clone back to the internal drive.



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10.7: Install Lion on an unsupported Mac with an upgraded processor
Authored by: Crazor on Aug 05, '11 11:02:30AM

The OSx86 scene has found a way to boot and install Lion on any 64bit Mac (or most PCs, that's what interests them). They remove the SupportedPlatforms.plist from the installer's .dmg and also patch the OSInstall.mpkg to remove another check. This could be of help for the hint author's case.

Only thing to watch out for is to not reboot the Mac at the end of the installation, open a terminal window and remove the SupportedPlatforms.plist from the fresh installation, too.

Edited on Aug 05, '11 11:03:32AM by Crazor



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10.7: Install Lion on an unsupported Mac with an upgraded processor
Authored by: cybert on Jul 03, '12 11:03:09AM

I just tried it, and I can confirm, it works!



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