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#Revert apple macbook pro operating system mac os
#Revert apple macbook pro operating system install

When the menu bar appears select Disk Utility from the Utilities' menu. After the installer loads select your language and click on the Continue button.Release the key when the Apple logo appears and wait for the loading to finish.Immediately upon hearing the chime hold down the C key.Insert Snow Leopard DVD into the optical drive and restart the computer.If possible be sure to back up your files. If you have the Early model then you will need to restore Snow Leopard from the DVDs that came with the computer:

#Revert apple macbook pro operating system install

To install the original factory version when the computer was new use Command-Option-Shift-R. To install the version of OS X that was currently installed use Command-Option-R.Ģ. Select Install OS X from the Utility Menu and click on the Continue button.ġ.Quit Disk Utility and return to the Utility Menu.

#Revert apple macbook pro operating system mac os

Set the Format type to Mac OS Extended (Journaled.) Click on the OK button and wait for the process to finish.

Set the partition scheme to GUID then click.

Click on the Erase tab in Disk Utility’s main window.

After Disk Utility loads select the drive (usually, this is the out-dented entry with the mfgr.'s ID and size) from the side list.

Select Disk Utility from the Utility Menu and click on the Continue button.

Wait patiently - 5-15 minutes - until the Utility Menu appears.

Restart the computer and after the chime press and hold down the ( Command-Option-Shift-R) keys until a globe appears.

Install Lion Through Yosemite on a New HDD/SDD The latter came with Lion pre-installed and no DVDs. The former came with a special version of Snow Leopard supplied on DVDs. This is a 17" MBP from Early 2011 or Late 2011.