Mountain Lion USB bootable

Inside your .DMG file you should have “Install OS X Mountain Lion” app, right click on it and press “Show package contents“, somewhere  inside you should have “InstallESD.dmg” package. This is the package (not the image) that content image disk, be careful! The package named Mac OS X Install ESD is the right one that you have to copy in your key using disk utility

Reference:

http://www.iclarified.com/entry/comments.php?enid=23486

http://osxdaily.com/2012/02/17/make-bootable-os-x-10-8-mountain-lion-usb-install-drive/

 

Also useful:

http://guides.macrumors.com/Mac_doesn’t_boot

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