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While convenient for those with fast broadband connections, sometimes you may find yourself in a location without fast Internet and would benefit from having a way to reinstall OS X from scratch. Instead, if you wish to reinstall OS X you simply reboot to the OS X Recovery HD and use the tools there to format your hard drive (should you choose to), then run the installer to download OS X from Apple's servers. Please try again." If this happens, Apple suggests creating a bootable installer using another Mac, otherwise you'll have to follow a more technical process involving Terminal to restore your Mac.Since its move to online purchasing and distribution of its operating system software, Apple has no longer included gray recovery DVDs with its Mac systems. Failed to personalize the software update. A message might say "An error occurred while preparing the update. Note that if you erased your ‌M1‌ Mac before updating to ‌macOS Big Sur‌ 11.0.1, you might be unable to reinstall macOS from macOS Recovery. If the installer doesn't see your disk, or says it can't install on your Mac or volume, you may need to erase the disk first using Disk Utility. These restart events can be expected and aren't anything to worry about. Once the macOS installation process is underway, your Mac may restart a show a progress bar several times, and the screen might be empty for minutes at a time.

If the installer offers you a choice between installing on Macintosh HD or Macintosh HD Data, choose Macintosh HD. Click Continue and follow the installer's instructions.When macOS Recovery has loaded, select Reinstall macOS from the utilities window.

If you're asked to select a user that you know the password for, select the one you want, click Next, then enter their admin password.Select the gear icon labeled Options, then click Continue.Turn on your Mac and continue to press and hold the power button until you see the startup options window.How to Start Up in macOS Recovery and Reinstall macOS Keep reading to learn how to start up in macOS Recovery and reinstall macOS 11 Big Sur on your M1-powered machine. If you experience issues running macOS Big Sur on your M1 MacBook Air, ‌M1‌ MacBook Pro, or ‌M1‌ Mac mini, or you want to start afresh with a new installation of the operating system, you'll need to boot into macOS Recovery, which is done slightly differently on Apple Silicon Macs compared to Intel machines.