I want to reinstall OS on my 2012 MacBook Pro. It shipped iwth 10.8, but now runs 10.9. Can I reinstall to 10.9, I do I have to reinstall 10.8 and upgrade again to 10.9?

I want to reinstall OS on my 2012 MacBook Pro. It shipped with 10.8, but now runs 10.9. Can I reinstall straight to 10.9, or do I have to reinstall 10.8 and upgrade again to 10.9?

Best to install 10.9 straight up. If you still have your OS 10.9 downloaded file you can use that, or you can go to the app store and download it again. It will be in your previous purchase history. Or you could even upgrade to 10.10. If you want to start from scratch you will need to boot from USB or DVD and initialise (erase) your internal HD. To do create a bootable USB thumb drive with OS 10.9 or 10.10 follow this guide
Create a bootable installer for OS X Mavericks or Yosemite - Apple Support
And heres a how to on installing a fresh copy of Yosemite (OS X 10.10)
http://osxdaily.com/2014/10/18/clean-install-os-x-yosemite/

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