Your Mac doesn’t work well after you’ve installed macOS High Sierra? Or something went wrong during the installation? One of the easiest ways to fix such issues is reinstalling the operating system. Don’t worry, it won’t affect your files, data, apps, user settings, etc. Only a fresh copy of macOS High Sierra will be installed on your Mac again.
Please note that if you need to remove the data and reset your Mac to factory settings, go for clean install macOS High Sierra. A clean install will delete everything associated with your profile, all your files and documents, while the reinstall will not.
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Once you’ve decided that you want to keep all your data intact, take advantage of our comprehensive guide on how to reinstall macOS High Sierra. But before you start, you have to prepare your Mac for the process.
Before You Begin: Back Up Your Data
Although the process of reinstalling is safe, it is still recommended to back up your data. Should something go wrong, you’ll be able to easily restore all necessary files.
There are a few incredibly easy ways to back up the files, documents, applications, etc. So, you can choose the most convenient one for you. One of the possible Mac backup solutions built into macOS is Time Machine. It allows frequent automatic backups. Surely, you can use iCloud, Dropbox or any other external storage to back up essential data.
Before reinstalling the macOS High Sierra, you might also need to clean the system junk. And not the system junk alone, but also gigabytes of other unwanted files like app leftovers, browser extensions etc. You don’t want to reinstall the operating system with all the clutter it contains, do you? You can clean up your Mac manually, but using an app like CleanMyMac X will save you tons of time. It will scan the system and safely remove all junk in a matter of minutes.
Once you’ve backed up your files and cleaned your Mac, you’re ready to reinstall macOS High Sierra.
A Step-By-Step Guide to Reinstall macOS High Sierra
Here’s how you can reinstall the macOS High Sierra and keep all files and user settings.
- Back up your Mac before you begin (just make sure you didn’t forget to do it).
- Click the Apple icon in the top left corner of your screen and choose Restart from the menu.
- Use the combination of Command and R keys; you’ll see the macOS Utilities window.
- Pick Reinstall MacOS.
- Click Continue.
- Select your hard drive (this is usually Macintosh HD).
- Click Install and complete the process.
That’s it! As you see, reinstallation is not a difficult process and it has an obvious advantage — it keeps all your data and configurations untouched. Now you can enjoy the new exciting features of macOS High Sierra, like faster Safari and better graphics.
However, if you don’t like the new version of macOS, don’t let it give you a bad time. You can always downgrade to Sierra. But before turning to such radical measures, try to reinstall the macOS High Sierra. Probably it will resolve all the issues.
We hope you found this article helpful. Have a nice day and stay tuned!
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[Update 11/29:Apple Releases macOS High Sierra Security Update to Fix Root Password Vulnerability, according to MacRumors]
You may have heard rumblings about an incredibly bad bug in macOS High Sierra that allows anyone to walk up to a Mac and log in as a root superuser without needing a password. Now the root superuser has ultimate control of any UNIX-based machine, and that’s the case with this bug; as root, you can pretty much “have your way” with a Mac. This post is to show you how the bug works and how to quickly enable a fix until Apple is able to send out a macOS High Sierra update.
The bug was discovered by developer Lemi Ergin, who found that anyone could sit down at a Mac and get superuser just by using the username “root” and a blank password. It works when trying to access an administrator account on an unlocked Mac, but even worse, it lets anyone log into a locked Mac using “root” and the blank password.
Want to try this on your own Mac? Here’s how (and this works from any Mac account, whether with admin rights or as a guest):
1) Launch System Preferences
2) Click on Users & Groups
3) Click the lock icon in the lower left corner to provide access for making changes to a user account
4) Type “root” as the User Name
5) Move the cursor to the Password field, click on it, but don’t type a password into the blank field
6) Click the “Unlock” button. The Mac should now give you full access to add a new administrator account, delete an account, and so on…
(With this bug, logging in as user “root” with a blank password provides full access to a Mac.)This also works at a Mac login screen, where you can click “Other” to sign in as someone other than the usual user of the Mac, then enter “root” as the user name with no password. That root user can see everything on the Mac, delete files, and wreak havoc…
Apple has responded to the revelation about the bug with a note that says:
“We are working on a software update to address this issue. In the meantime, setting a root password prevents unauthorized access to your Mac. To enable the Root User and set a password, please follow the instructions here: https://support.apple.com/en-us/HT204012. If a Root User is already enabled, to ensure a blank password is not set, please follow the instructions from the ‘Change the root password’ section.”
This might not be an issue if you’re the only person with access to your Mac, but if you’re in an environment where someone has unfettered access to your Mac you should set a root account with a password.
Rather than repeat what is said on the Apple support page referenced in the quote above, we suggest that you head to that web page immediately and follow the instructions to enable the root user on your Mac. Note that once Apple has resolved the issue with a patch, you should disable the root user.
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