How to Install macOS

 Steps 
 Download item 

 1. 1 

 Determine if you are using an Apple  or Intel Mac. Most new Macs introduced in late 2020 and later have switched to using Apple silicon in the system. [1] 

 • To do this, click  the Apple menu () > Then see if there is anything about that Mac that says "Chip" (Apple silicon) or "Processor" (Intel processor)


 2 

 Shut down or restart your Mac.This will give you access to the recovery tool. 

 • Your computer needs internet access  if you don't have a local copy of macOS.[2] 


3 

 Hold down ⌘ Cmd+R immediately after pressing the power button. This key combination tells your Mac to reinstall the same version of macOS that you already have installed. If you're hoping for a different version, try these alternatives: 

 • To update macOS to the latest version compatible with your Mac, press ⌥ Opt+⌘ Cmd+R.For example, an early 2012 Mac will not be compatible with macOS 10.15, Catalina.[3] 

 • On an Intel-based Mac, to install the macOS that came with your Mac, no matter how outdated it is, press ⇧ Shift+⌥ Opt+⌘ Cmd+R. If you don't have version 10.12.14, Sierra, this key combination does not work. 

 • If you have never installed 10.12.14 (Sierra),  ⌘ Cmd+R will install the operating system without associating it with your Apple ID. This key combination allows you to erase the disc before giving it to someone else.[4] 

 • On an Apple Silicone Mac, you can also turn on the Mac and  hold down the power button until  the startup options screen appears. Then click on the gear icon labeled "Options".[5] 


 4 Release the keys when you see the Apple logo 

 You may see a spinning globe or a prompt for  a firmware password.[6] 
 • If you previously clicked Options, Skip this step in Apple's Silicon Mac Boot Options.




5 

 Choose whether to erase the disc. Note that this will erase your drive and  lose all information on your computer. You can also choose "Restore from Time Machine Backup"; if you don't want to lose it all.[7] 


 6 

 Click to select Reinstall macOS. This will reinstall  macOS but  keep your user files and settings.



7 

 Click Next. You  start by reinstalling macOS. 


8 

 Follow the onscreen instructions to install macOS. This also includes  the selection of the installation location of the operating system. 

 • Don't put your Mac to sleep or close the lid during the setup process. Your Mac may restart several times, showing a blank screen and some progress bars, but that doesn't mean the installation is complete.[8]

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