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If the computer is equipped with the Apple T2 Security Chip and a macOS update has never before been installed on the machine, macOS Recovery will install the latest version of the OS that was installed on the computer.If macOS Sierra 10.12.4 or another later version of macOS has never before been installed on the computer, the macOS version that will get installed will be the one that originally came with the machine, or another macOS version that is closest to the original one.This will cause macOS Recovery to install the latest stable macOS version that is compatible with the machine. On a Mac with an Intel processing unit, you can press down and hold the Option + Command + R keyboard combination (instead of the Command ⌘ + R combination) as soon as you turn on the computer.If you want, you can get it to install a different version of the OS by using one of the following options: The default setting of macOS Recovery is that it will install the latest version of the operating system that was previously installed on the computer. Additional options and tips for installing/reinstalling macOS After that, click on the Shut Down button to turn off the Mac. If you have reinstalled the OS because you intend to sell or give away your Mac and want to allow its new owner to set it up themselves, press Command-Q to close the Setup Assistant and leave the setting-up process to the future owner of the computer. Complete the set up according to your personal preferences and you will be good to go. Once the installation of macOS is complete, you will be asked to set up the preferences of the computer. If you are given the choice between installing Macintosh HD or Macintosh HD Data, pick the first option.If the macOS installer cannot find your disks or it tells you that the installation cannot be completed on the specified disk, you may first need to erase that disk and try again.
BOOT INTO LOCAL RECOVERY MAC OS SIERRA PASSWORD
If you are asked to unlock the disk of your Mac, do so by filling in the password that you use to log in to your main Mac account.Until macOS gets reinstalled, do not close, put to sleep, or turn off your MacBook! While macOS is being reinstalled, your Mac may restart several times and the screen may go black and stay that way for several minutes – even if this happens, stay patient and wait for the process to complete. Do not put your Mac to sleep or close its lid while the reinstallation process is underway.Be sure to adhere to the following tips while in the process of reinstalling macOS.Follow the on-screen instructions and steps – they will guide you through the whole process.
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From the Utilities screen of the macOS Recovery, select the Reinstall option and click on Continue.Now that you have entered Recovery Mode on your Mac, it is time to reinstall the OS of the computer.
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Reinstalling macOS Big Sur from Recovery Mode If your Mac requires you to log in to any of your Mac accounts, select an account you know the password for and that has Admin privileges. Keep holding them until the Apple logo (or another image) gets displayed on the screen. Then start the computer and immediately after that hold down the Command ⌘ + R keys from the keyboard.
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