You may need to reinstall your macOS operating system because some kind of problem has occurred and something isn’t going well. In that case, you can follow the simple steps in this tutorial so that you can use the Recovery option to get your macOS Catalina system back to 100% on your built-in or external drive.
With macOS Recovery everything will be much easier than doing it by other methods. It will allow you to follow some routines by which you can even erase the bootable disk if you want.
The requirements to be able to follow this tutorial are quite rudimentary. All you need is to have a Mac and be connected to the Internet, whether wired or WiFi. That’s how simple Apple puts it on you to reinstall the operating system so that everything flows like at the beginning.
Steps to reinstall macOS Catalina
While these steps could also be used to reinstall other versions of macOS, in this case, we’ll focus on macOS Catalina. As I said, macOS Recovery will be used. And the steps to follow are:
1. Turn on your Mac.
2. Press and hold the keys:
- Command+R to install the latest version of macOS (recommended).
- Option+Command+R to upgrade to the latest version of the operating system. Sometimes, when you have macOS Sierra or later, as is the case with Catalina, this combination will install the macOS operating system included on your Mac or the nearest version available. Also, for new computers with an A2 security chip, if you’ve never installed a macOS update, this combination will install the latest version of macOS that was installed on your machine.
- Shift+Option+Command+R to install the macOS that came standard with your computer or the nearest version available today. This option may not be available on all Apple machines.
3. Drop them when you see the Apple logo, a balloon rotating on the screen, or another home screen.
4. If he asks you to enter a password, do so. This is the mac administrator password or the firmware protection password.
5. Now you should see the utility window if everything went well. Then you will have booted from the macOS Recovery feature.
6. Now choose the option you prefer:
- Restore from a Time Machine backup, if you had a restore point that you want to return to.
- Reinstall macOS, which would be the option you should choose in this case to reinstall.
- Get help from the Internet to display more information.
- Disk options, from where you can erase everything, repair the disk, format, partition, etc. This option might be a good choice if you plan to sell your Mac to leave it clean of data to be delivered to someone else.
7. If you selected Reinstall macOS, then the macOS Catalina installation process will begin.
8. Click Continue on the first screen that appears and follow the on-screen instructions. It will ask you to choose the hard drive where to install if you have several.
- If the disk was password locked, it will prompt you, it’s the same one you use to sign in.
- If it shows you a message telling you not to be able to install on that disk or you can’t see the volume of the disk where you want to install it, you’ll probably need to go back to the utility screen and disk options erase it sooner.
- Remember that if you get the option to install on Macintosh HD or Macintosh HD-Data, the first option is correct.
9. Now you just have to wait for the installation of macOS Catalina to complete without it going to sleep, that is, without closing the lid. During the process, it may restart multiple times and a progress bar may be displayed.
10. In the end, it will restart once more and a setup wizard will appear. If you are selling it, then press Command-Q to exit without completing that process and have the new user configure it to your liking. But if it’s for you, then complete the setup process.
In addition to the macOS Recovery option, you can also use other methods to reinstall macOS Catalina or other versions. For example, you can go directly to the App Store, Apple’s software store.
From there you can go to Software Update preferences. If your machine is compatible it will allow you to choose the option to install macOS Catalina.