How to Reinstall macOS Big Sur/Catalina/Mojave: On Mac, iMac, MacBook Pro, Air

Last Updated on Jun 17, 2021

Are you thinking for long times for reinstall macOS Big Sur or MacOS Mojave Without USB or Without Disc? Follow this article and re-setup MacOS on Mac in just 1 hour or less. Installing macOS on Mac successfully in a single trial is like cracking the toughest exam. But once we face any error, after that we will get de-motivated, and it becomes a tough job to install macOS. There are various methods of installing macOS on Mac. We preferred two ways to reinstall the App Store to download and install the latest version of Mac.

we are happy to help you, submit this Form, if your solution is not covered in this article.

There are two ways to perform reinstallation one is installed macOS on the current version, and other is erase your Mac and then perform reinstall on PC. No matter which option we select, it is our prior duty to take backup. Time machine is the best application available to make a backup. This will help you to restore all the settings after installation gets completed.

πŸ—£Useful: MacOS Monterey or later macOS users can [M1 Macs only] Erase all Content and Settings on Mac, To fix internal Software issues and Clean up Data.

Reinstall macOS Big Sur/Catalina/Mojave on MacBook, iMac

What we checked and required before Re-Install MacOS [Clean install or Restore] Process start?

1. Take A Full backup your Mac using Time Machine or Use online cloud storages like Dropbox, iCloud [Easy] and Google Drive.
2. To reinstall a new copy of macOS Catalina [Latest] or Earlier macOS Mojave, you need a good quality internet connection. Otherwise, you have to wait for a long time or Stuck the download in-between the installation. Quick Tips: Before Erase Mac you can force a reboot using the Power button and abort installation process.
3. For MacBook Pro, Air needs enough battery backup or power source during the installation process.

You Want Reinstall MacOS Without an internet connection, Use Flash Drive During Installation Time.

1 How to reinstall macOS Mojave

Let’s start the guide of how to reinstall macOS Catalina/Mojave on Mac, iMac, MacBook Pro/Air

Step #1:

  • For Intel Mac: “Shut Down your Mac” then start again or “Restart.” After your Mac plays Startup sound, “Press and Hold (Command + R)” continuously. Follow Step 2:-
  • For M1 Mac [Shut Down your Mac, and Turn on After 10 seconds, By press and Hold on Power key until you see Startup Disk and Settings option on the screen next to Startup disk > Select Settings on M1 Mac] You will see Apple Logo with the process bar, Still, press and hold both keys. Reboot Mac by the following methods, Follow Step 2:-
2 Reboot in Reinstall Mac for Mojave
  • Command+R:- This keys will be helpful for you to reinstall the macOS version which was recently installed.
  • Command+Option+R:- (For Upgrade MacOS Version) It will reinstall the latest macOS compatible with your MacBook or Mac.

Step #2: Once you see macOS window follow the next steps. Alternatively, if you don’t want to perform clean install the go to the step 7. [Skip this]

Follow from step 7, if you Reinstall MacOS Mojave without Data loss.

For Clean install: Erase All Data And Start Reinstall

Step #3: Select β€œDisk Utilities” and there click on β€œErase.” [View or Manage Drives for Erase Partition, Remove Data and all]

2 Disk Utility for reinstall MacOS Mojave

Step #4: Give any name to Disk and select β€œMac OS Extended (Journaled)” or β€œAPFS” and luckily if you find Scheme then set it as β€œGUID Partition Map.”

3 Erase Data from Drive to Reinstall MacOS Mojave

Step #5: Click β€œErase.”

Step #6: When the process is done, close β€œDisk Utility” and get back to the β€œmacOS Utilities.”

[Also Useful: Clean install MacOS using USB Drive.]

Step #7: Select β€œReinstall macOS”. The second option in Disk utilities window

Reinstall MacOS Mojave on Mac

Step #8: Click β€œContinue.” The Mac will ask you to select the disk if you don’t find your Startup Disk then click on β€œShow All Disks.”

Step #9: Click on β€œInstall” and sit back it will take a few minutes to complete the installation, and after that immediately Mac will reboot.

You need to wait until you see the welcome screen on Your Mac, MacOS Catalina, MacOS Mojave setup windows. That’s it.

You need and help or Question on the installation of MacOS, Comment me or Leave us your problem on the From here.

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jaysukh patel

Jaysukh Patel is the founder of howtoisolve. Also self Professional Developer, Techno lover mainly for iPhone, iPad, iPod Touch and iOS, Jaysukh is one of responsible person in his family. Contact On: [email protected] [OR] [email protected]

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