How can i down great a new mac pro 13" retina with osx 10.8 Mountain Lion to osx 10.7 lion?

Hi Guy's,
Can you help me with the following problem please?
I have a new Macbook pro 13" with retina and a ssd HD.
On this machine is a osx 10.8 Mountain lion installed.
I need to down great this machine to osx 10.7.3. lion
Bud it won't work.
I use a usb key to bood to 10.7.3 it works always on a normal macbook pro.
Can someone help me on this please?

You can't. No new Mac can run any older version of OS X then what originally came on it.
There are a few exceptions but to do so you would need a model that also came with the older OS at some point but then you would also need the older OS X installer files. Which aren't available to a Mac that came with a later OS X version.

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