Also, I think it would be a good chance to clean up my system. If you reinstall Make a simple install after you reformatted your drive with Disk Utility. After the install, the setup process will start and you can choose if you want to restore from Time Machine. I would recommend you to deselect the System to restore, just your home directory and your applications. This the closest you can get to a "clean" install, without manually migrating your data and setup again every single app.
A clean install is one where the core OS comes from a valid installer. Past that, you can test the system for whatever level of "fitness" you require and only move users, user data and third party apps from a backup in a controlled manner if desired. I like to look at the loss of data in the opposite direction.
When that installation goes badly, the loss has typically already happened. If you don't have a backup and restore system where by you can get back to the pre-upgrade status, you might not want to change anything on the system as you can't really recover from a random failure at that point either - let alone have a good option if the software you have installed isn't compatible with the new OS.
To reinstall macOS follow these steps:. Our newsletter is typed with care for all the Mac-loving app-connoisseurs. Subscribe for a few notes from us each month containing app tutorials, productivity tips, and the latest Mac buzz. Try free. Restart your Mac, holding down the Command and R keys until you see the Apple logo. Click Continue.
5 things to do before upgrading to OS X Mavericks
Choose the last backup before you upgraded to macOS High Sierra. Wait for your Mac to restart.
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. Restart your Mac, holding the Alt key and, when you see the option, choose the bootable install disk. You should check for macOS updates at this point.
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 If your Mac experiences a slowdown after the update, try these tips to speed up the newly updated system and improve performance 3 Ways to Speed Up macOS Catalina and Improve Performance 3 Ways to Speed Up macOS Catalina and Improve Performance If you updated to macOS Catalina and find that your system is slow, here are some simple fixes to help restore performance.
How to revert to Mavericks from the Yosemite public beta
Here are a few reasons why you might want to reinstall macOS. Why not try troubleshooting your own Mac first next time? 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.
How to Backup Your Files Before Upgrading to OS X Mavericks
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. Email Facebook Whatsapp Pinterest Twitter. Enjoyed this article?