Easiest Steps to Install and Run OS X 10.8 Mountain Lion Dev Preview 1 on Unsupported Mac Machines – Apple has just seeded a Developer Preview edition version 1 of the next generation operating system, OS X 10.8 codename Mountain Lion.
Of course with a new major update, this OSX 10.8 said to offer more speed and features as well as stable performance. But even so, there are several system requirements must be fulfilled for users who want to update their old Mac either from 10.6.8 Snow Leopard or 10.7.2 Lion.
We’ve talked a little bit about some OSX 10.8 previews, features and system requirements here. And if your current Mac machine is fully compatible to run Mountain Lion on it, you can simply read our guide to make a clean OSX 10.8 install via bootable USB drive. But if unfortunately your Mac machine is said too old to run the Mountain Lion, then simply read following hack to port OSX 10.8 on unsupported Mac machine.
This trick has been shared by a member of MacRumors forum and he has tested it on an unsupported mid-2007 white MacBook (a Mac machine powered with Intel GMA 950 GPU, 2GHz Core 2 Duo CPU, 1GB of RAM). He also confirmed that the OSX 10.8 running pretty well with full graphic acceleration.
All what you need to do is below but you’ll need a little bit amount of patience. Uh and one more thing, you’ll still need a fully supported Mac to copy some necessary files over. Curious? Read on..
How To Install OS X 10.8 on Unsupported Mac
2- Remove HDD from the MacBook White, pop it into the OSX 10.8 compatible Mac
3- Install Mountain Lion there like normal
4- Set / customize everything up until you see the OSX desktop
5- Now remove the HDD from the compatible Mac
6- Pop it back into the MacBook White (the unsupported one)
7- Restart the MB White and hold down “CMD + V”.
8- It should say:
Incompatible Mac detected. Reason: Mac-F4208EC8″ the “Mac-F4208EC8″ is a unique ID for your Mac, so copy that down.
9- Remove the HDD back from the MacBook White
10- Pop it again into the compatible Mac
11- Reboot back into the OSX 10.8 Mountain Lion
12- Then go to “/System/Library/CoreServices” on the Mountain Lion partition
13- Add the unique ID that you copied previously to PlatformSupport.plist file
14- Also, in PlatformSupport.plist, add your model identifier.
In this case if you are using a MacBook White, add MacBook2,1 right above MacBook6,1. This step is important as the EFI reads this by sequence.
15- Then boot it back using the MacBook White and confirm that the OSX 10.8 is booting.
16- Once done, you should now be able to reach Desktop.
For MacPro1,1 and 2,1 with upgraded graphics card, you should get a perfectly working OSX 10.8 otherwise you’ll only have Desktop with no accelerated graphics whatsoever, only framebuffer. If your Mac is one of the unfortune, you’ll need to install the right kext file for your corresponding graphic card.
17- It means you need to either manually copy and install the right kext or use kexthelper.
18- Now back to the Mac Book white
19- Install the kext using KextHelper and reboot.
20- Once reboots, you should be able to see a pop up message saying that the kext isnt compatible. If yes, reboot.
21- Boot into Single User Mode (Command+S ) and type the following:
chmod -R 755/Volumes/~MLPartitionName/System/Library/Extensions/AppleIntelGMA950.kext
chown -R root:wheel /Volumes/~MLPartitionName/System/Library/Extensions/AppleIntelGMA950.kext
22- Do not forget to remove cache and rebuilt with this command:
rm -rf /Volumes/~MLPartitionName/System/Library/Extensions.mkext
kextcache -k /Volumes/~MLPartitionName/System/Library/Extensions
23- Finally reboot.
That’s it. In short, those steps above are similar when you are Hackintoshing. For further questions and queries you can simply head to MacRumors’ official forum thread here. Or if you want to install OSX 10.8 ML DP1 on a Mac Pro, j4mie has posted a nice tutorial in his blog.