Is upgrading from Lion to Sierra as fresh install?

Discussion in 'macOS' started by TazmoStarkana, Jan 10, 2017.

  1. TazmoStarkana macrumors regular

    Jun 12, 2016
    My laptop is running OS X Lion. I want to upgrade to Sierra as a fresh OS install. Skipping the versions inbetween.

    How would I go about doing this?

    When I reboot holding CMD+R I only see the option to reinstall Lion.

    Any instructions on how to go about this would be MUCH appreciated.
  2. keysofanxiety macrumors G3


    Nov 23, 2011
    You can download Sierra, then mount it to a bootable USB and boot from that to wipe the drive clean and do a fresh install. Sierra will download to the Applications folder and will be called something synonymous with "Install macOS Sierra". You can make a bootable USB by reviewing the instructions here:

    Alternatively you can update directly to Sierra within OS X, then hold CMD+R to do a fresh install following the installation, as the Sierra update will also update the Recovery partition.
  3. TazmoStarkana thread starter macrumors regular

    Jun 12, 2016
    When I do
    When I do download the installer and put it on a USB drive and select it from the boot options after rebooting, will it go directly into installer mode? If so will it erase all data on the disk and start fresh? Or do I have to do a CMD+R, select disk utility to clean Macintosh HD, and then reboot again but this time from the USB to start the fresh install
  4. Weaselboy Moderator


    Staff Member

    Jan 23, 2005
    Nope... close though. :)

    Once you make the USB key, you would hold the option key then select it as the boot source. Then you will see the recovery screen. Then use Disk Util to erase the internal drive and install the OS.
  5. TazmoStarkana thread starter macrumors regular

    Jun 12, 2016
    Thanks for all the info I have it in progress!

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