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Should I upgrade OSX 10.8.5 to Yosemite?
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Take a Time Machine backup first.
Copy the installer file to a USB and/or make a bootable USB installer with DiskmakerX.
If you hit problems be prepared to carry out a fresh install over the upgrade.
If still problems be prepared to revert or start over.
Be prepared for a faultless install and no problems afterwards - my 4 were like that
Copy the installer file to a USB and/or make a bootable USB installer with DiskmakerX.
If you hit problems be prepared to carry out a fresh install over the upgrade.
If still problems be prepared to revert or start over.
Be prepared for a faultless install and no problems afterwards - my 4 were like that
Before you upgrade, use System Information to take a note of the boot ROM version. Just in case you later decide to install something less than Yosemite; a firmware downgrade may be required.
Similarly, set aside the installers for Mountain Lion and Mavericks. Having the installers readily available in addition to your backups of Mountain Lion is a convenience that you might later appreciate.
Similarly, set aside the installers for Mountain Lion and Mavericks. Having the installers readily available in addition to your backups of Mountain Lion is a convenience that you might later appreciate.