Clean install mac os x mountain lion time machine


How to use macOS Recovery

How to Downgrade from macOS 10.13 High Sierra

That's because it's nearly identical to the clean install guide for Lion we wrote last year. This download is over 4GB, so if your Internet connection isn't super fast, plan to get some other stuff done while you wait. As soon as the download is complete, exit out of the installation prompt.


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We don't want to do an install right now. Right-click or control-click on the program icon and select "Show Package Contents. Open up Disk Utility it's in the Utilities folder in Applications. At this point, you should see the various hard drives connected to your Mac. If you haven't already plugged in an empty USB thumb drive or a hard drive with an empty partition, do that now. Select "InstallESD. Wait for your Mac to restart.

1. Download Mountain Lion From the Mac App Store

Navigate to the most recent backup and to the files and folders you want to restore and use Time Machine to retrieve them. If you used GetBackup Pro or another backup tool to backup your High Sierra disk, use its restore facility to retrieve files. Manually copy any other files from cloud storage or an external disk.

To get apps from Setapp, download the Setapp desktop app and sign into your account. Then install other apps from there. How to downgrade without a Time Machine backup If you have a bootable installer, say on a USB stick, of the version of macOS you want to revert to, you can use that to downgrade from High Sierra. To reinstall macOS follow these steps: Plug the new bootable installer into your Mac.

How to Clean Install Mac OS X Mavericks and Mountain Lion!

Restart your Mac, holding the Alt key and, when you see the option, choose the bootable install disk. Launch Disk Utility, click on the disk with High Sierra on it the disk, not just the volume and click the Erase tab. Click Erase. When the disk has been erased, restart by holding down Command-R and wait for the macOS Utilities window to appear.

The Safe Mac » How to reinstall Mac OS X from scratch

Follow the onscreen instructions and wait for your Mac to restart. When it restarts, ignore the option to migrate data from a backup. Once you see the Welcome screen, your Mac is back to factory defaults. Next, confirm your keyboard layout and hit Continue again.

Start to downgrade from macOS High Sierra

Here you can select From a Mac, Time Machine backup, or startup disk to import the data you backed up earlier. Your Mac will then prompt you to sign in with your Apple ID.

Perform a Clean Install of OS X Mountain Lion on Startup Drive

However, this will prevent you from using the App Store, FaceTime, and similar. You should check for macOS updates at this point. Click Get and walk through the steps to initiate the update. Depending on how old your Mac is, you may not be able to update to the newest version.

I was able to upgrade to macOS Read More will take it from here. A Troubleshooting Guide Apple is known for having great customer service and repair technicians, but if you're no longer under warranty that expertise doesn't come cheap.

Step 2: Erase the hard drive

Why not try troubleshooting your own Mac first next time? Explore more about: Your email address will not be published. If you use the internet recovery mode, you can reinstall the latest version of macOS compatible with your machine. However, this is only an option for Sierra and later.

When writing this I assumed that most people resetting a Mac would be doing so on an older one and thus this wouldn't be an option. Top Deals.

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