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Note: You need to be logged in to your Admin Account in order to Enable or Disable the option for “Set Date and Time Automatically”. Correct Date & Time Manually On Mac. As mentioned above, your Mac can end up displaying incorrect time whenever you happen to cross a time zone while travelling and also due to minor software glitches on your Mac. Mac OS, Mac OS X, or macOS, is the operating system that resides on Apple’s desktop and portable computer lineup. Built upon a Unix core, it is easy to use yet highly advanced, extremely stable, and an excellent OS for productivity and creation.
Reinstall from macOS Recovery
macOS Recovery makes it easy to reinstall the Mac operating system, even if you need to erase your startup disk first. All you need is a connection to the Internet. If a wireless network is available, you can choose it from the Wi-Fi menu , which is also available in macOS Recovery.
1. Start up from macOS Recovery
To start up from macOS Recovery, turn on your Mac and immediately press and hold one of the following sets of keys on your keyboard. Release the keys when you see an Apple logo, spinning globe, or other startup screen.
Reinstall the latest macOS that was installed on your Mac (recommended).
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Upgrade to the latest macOS that is compatible with your Mac.
Reinstall the macOS that came with your Mac, or the closest version still available.
You might be prompted to enter a password, such as a firmware password or the password of a user who is an administrator of this Mac. Enter the requested password to continue.
When you see the utilities window, you have started up from macOS Recovery.
2. Decide whether to erase (format) your disk
You probably don't need to erase, unless you're selling, trading in, or giving away your Mac, or you have an issue that requires you to erase. If you need to erase before installing macOS, select Disk Utility from the Utilities window, then click Continue. Learn more about when and how to erase.
3. Install macOS
When you're ready to reinstall macOS, choose Reinstall macOS from the Utilities window. Then click Continue and follow the onscreen instructions. You will be asked to choose a disk on which to install.
- If the installer asks to unlock your disk, enter the password you use to log in to your Mac.
- If the installer doesn't see your disk, or it says that it can't install on your computer or volume, you might need to erase your disk first.
- If the installer is for a different version of macOS than you expected, learn about macOS Recovery exceptions.
- If the installer offers you the choice between installing on Macintosh HD or Macintosh HD - Data, choose Macintosh HD.
Please allow installation to complete without putting your Mac to sleep or closing its lid. During installation, your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.
If your Mac restarts to a setup assistant, but you're selling, trading in, or giving away your Mac, press Command-Q to quit the assistant without completing setup. Then click Shut Down. When the new owner starts up the Mac, they can use their own information to complete setup.
macOS Recovery exceptions
The version of macOS offered by macOS Recovery might vary in some cases:
- If macOS Sierra 10.12.4 or later has never been installed on this Mac, Option-Command-R installs the macOS that came with your Mac, or the closest version still available. And Shift-Option-Command-R isn't available.
- If you erased your entire disk instead of just the startup volume on that disk, macOS Recovery might offer only the macOS that came with your Mac, or the closest version still available. You can upgrade to a later version afterward.
- If your Mac has the Apple T2 Security Chip and you never installed a macOS update, Option-Command-R installs the latest macOS that was installed on your Mac.
- If you just had your Mac logic board replaced during a repair, macOS Recovery might offer only the latest macOS that is compatible with your Mac.
If you can't get macOS Recovery to offer the installer you want, you might be able to use one of the other ways to install macOS.
Other ways to install macOS
- You can also install macOS from the App Store or Software Update preferences. If you can't install macOS Catalina, you might be able to install an earlier macOS, such as macOS Mojave, High Sierra, Sierra, El Capitan, or Yosemite.
- Or create a bootable installer disk, then use that disk to install macOS on your Mac or another Mac.
In this article we will understand – How to reset the Mac to factory settings.
Feel you need to start everything from scratch? Know that you can restore your Mac to its factory settings at any time. This means that all the results of your activity will be erased, and the device will look out of the box (maybe with the exception of a couple of scratches). This is a simple procedure that does not take much time, and we will describe how to conduct it safely and efficiently.
Often, deleting all the data becomes a cause of anxiety and even hysteria, but there are times when it cannot be avoided. For example, if you decide to sell your computer. Part of this is removing the device from iTunes and breaking all connections to the cloud. But another important aspect is the restoration of factory settings.
Read more: How to Monitor your macOS Stats with Notification Center?
How to Factory Reset macOS to Original Default Factory Settings
- First, make sure your Mac is connected to the Internet. The process of formatting the disk is quite simple, but you will need to get access to the factory settings when everything is finished. It also does not hurt to connect your MacBook to the network to avoid draining the battery;
- Now go to the “Apple menu” (the one on which is the Apple logo) and select the reload command;
- Wait until the computer turns off and starts up again, then, when the reboot grey screen appears, hold down the “Command” + “R”;
- This will lead you to the macOS utilities, where you can make important and potentially dangerous changes;
- Select “Disk Utility”;
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- Now the process will start to differ slightly depending on the version of macOS. Here you need to find the necessary disks, select them and go to the “Erase” tab;
- Next, in the format options, select Mac OS Extended (journal) or APFS and click “Erase” again. After the procedure is completed, go to the “Disk Utility” menu and select “Exit”.
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Now you have deleted all the data, but this is only half the way. When you exit the Disk Utility menu, you will see the Reinstall the current macOS item.
- Select “Reinstall macOS” option and confirm that you really want to continue. You may have to go through several confirmations before the installation is ready to begin;
- Here you need an internet connection. Apple stores all factory data on its servers, so your Mac will be able to find the original version of the operating system and load all its settings;
- Now be patient and everything will be fine after the ending of installation your clean OS.
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Obviously, a full reset is a serious step, and you need to make sure that no important data will be lost. Backing up the computer is a necessary part of the procedure and it is strongly recommended to start with it. Here are some ways you can save data.
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- Use Time Machine, if possible. The program will save the settings and data on an external drive. After that, you can put a “snapshot” of your Mac, including all the information, into your Time Capsule and transfer them to another system;
- You may need to reinstall Apple applications on a new computer. Visit the “Mac App Store”, and you will see the option to reinstall all applications;
- If you already have a second computer, you can use the Migration Assistant to simply transfer data using fast disk cloning;
- Cloud backups can help a little, but it’s volume is hardly enough for all the information of a computer system, therefore in such procedures it is better to use physical methods of copying.