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Guayoca
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Q: How to go back to Yosemite from El Capitan in my IMac

How to go back to Yosemite from El Capitan

iMac with Retina 5K display, OS X El Capitan (10.11.1)

Posted on Nov 15, 2015 9:51 AM

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Guayoca

Q: How to go back to Yosemite from El Capitan in my IMac

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  • by Dr.Mac.,

    Dr.Mac. Dr.Mac. Nov 15, 2015 10:36 AM in response to Guayoca
    Level 3 (636 points)
    Nov 15, 2015 10:36 AM in response to Guayoca

    If you use Time Machine to back up your Mac, you can easily revert to a previous version of OS X. 

    Reverting erases any changes you made to the files on your Mac since you installed the new version of OS X. To save new or revised files, copy them onto a different disk or back them up before you follow these instructions. Be sure to also back up the information you want to keep to an external device.

    1. Choose Apple menu > Restart. After your Mac restarts and you hear the startup chime, hold down the Command (⌘) and R keys.
    2. When the Apple logo appears, you can release the keys.
    3. Select “Restore from a Time Machine Backup,” then click Continue.
    4. Select your Time Machine backup disk.
    5. Select the Time Machine backup you want to restore. To restore your computer to the state it was in before you installed the new version of OS X, choose the most recent backup that occurred prior to installing OS X Yosemite.
    6. Follow the onscreen instructions.
    7. If you backed up files as described in the Important message above, you can restore them now. If you backed them up using Time Machine, click the Time Machine icon  in the menu bar, choose Enter Time Machine, then retrieve your files.

     

    Your Mac came pre-installed with Yosemite, you can restart into Internet Recovery mode (Command+Option+R), erase your Macintosh HD and reinstall Yosemite. You can restore your Mac to factory settings by erasing your Mac. Before you erase, back up your essential files. Important:  To reinstall OS X, you must be connected to the Internet.

    1. In the menu bar, choose Apple menu > Restart. Once your Mac restarts (and the gray screen appears), hold down the Command and R keys.
    2. Select Disk Utility, then click Continue.
    3. Select your startup disk on the left, then click the Erase tab.
    4. Choose Mac OS Extended (Journaled) from the Format menu, enter a name, then click Erase.
    5. Important:   Erasing the disk removes all the information from the disk. Be sure to back up the information you want to keep to an external device.
    6. After the disk is erased, choose Disk Utility > Quit Disk Utility.
    7. Select Reinstall OS X, click Continue, then follow the onscreen instructions