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

Aug 05, '11 07:30:00AM

Contributed by: heymike

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:

[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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Mac OS X Hints