Can I install 10.8 on a mac book pro purchased with 10.9?

A few weeks ago I bought a mac book pro with 10.9 preinstalled on it.
I wish now to revert to 10.8 to solve some backward compatibility problems. Is that possible? I tried to prepare a bootable USB but unfortunately the mac does not want to boot on it....
What is the easiest procedure to revert to a previous OS? Do I have to uninstall 10.9 before I try to boot on the usb?
Kind Regards,
Tonkiplis

Normally it is not possible to run a Mac on an OS which is earlier than the one which came with the computer.

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