How to boot form usb to instal montain lion one emty hard drive

i have new macbook air and i had erase the hard drive how can i reinstal the montain lion again but not by downloading it, but form USB flash

faez wrote:
i have new macbook air and i had erase the hard drive how can i reinstal the montain lion again but not by downloading it, but form USB flash
First, of course, you need a Flash drive with the Mountain Lion installer on it - do you have that? If you have the installer file, this is an explanation of how to create a bootable version of it on a USB drive.
Second, you have a very new MacBook Air which most likely is not compatible with the ML installers which are sold for general use, at least not yet. By downloading it, you get an installation specific to your Mac.

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