New Mac with Mavericks, I want downgrade to Mountain Lion

I have a New Mac Mini with Mavericks 10.9 but I need use Mountain Lion 10.8, How can I uninstall Mavericks and install Mountain Lion ???

jmgaco wrote:
No, the computer that had Mountain Lion installed when new is the my friend´s computer (I have a flash bootable of this computer).
If you mean you have a bootable flash drive with a copy of the Mountain Lion installer on it, it may install that OS on the erased Mini's drive, assuming it will boot your Mini to begin with. On the first startup after installing that OS, as part of the setup process you should be asked for your Apple ID, which should link the license for that installation to you rather than to your friend.
But because this is unsupported & possibly a violation of the ML licensing terms, I agree that if possible you should call Applecare & discuss the implications of doing this before proceeding.
You also might want to consider buying an external drive & installing ML & Server 2.0 on it rather than on your Mini's internal drive, & booting from that for your certification work. That way, the Mini will still run its "native" OS when booted from the internal. To keep that system from being influenced by the ML one in any way, you should immediately unmount the internal drive after starting up from the external drive, or you can create an "fstab" file on the ML system with an entry to prevent the internal drive from mounting when starting up from the external.

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