HT201475: Upgrade to OS X El Capitan

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twitch730
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Q: how can i stop OS X installer and go back

I have tried to up grade to El Captian on Macbook pro 17 inch. It says OS X could not be installed on your computer. File system verify or repair failed. How can i just go back to old system for now.

MacBook Pro (17-inch Early 2009)

Posted on Jan 16, 2016 7:40 PM

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twitch730

Q: how can i stop OS X installer and go back

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  • by lllaass,

    lllaass lllaass Jan 17, 2016 1:31 AM in response to twitch730
    Level 10 (188,027 points)
    Desktops
    Jan 17, 2016 1:31 AM in response to twitch730

    To go back:

    - backup your data

    - Download the appropriate OSX  installer. They should be listed in the Purchased section of the Mac App Store if you previously downloaded them with the ID you are using.

    - Make a bootable USB media using the following:

    DiskMaker X

    - Boot from that media

    - Format the startup disk and install OSX from the bootable media

    - Restore your data


    If you can't download the installer the boot to Recovery

    OS X: About OS X Recovery - Apple Support

    and backup your data. You can use Disk Utility to restore the currant installation to an external disk

    Disk Utility (El Capitan): Restore a disk image to a disk

    Then use Disk Utility and try to repair the HD. If it can be repaired format the HD and install OSX via Recovery.

    Then restore your data