You can access recovery without a partition using Network Recovery: hold Command+Shift+R while turning on your Mac and it will download the Recovery features for you. Failing that, you can create a bootable USB installer, and boot from that by holding 'Option' while turning on your Mac. If neither of these options work, don't panic! You've got a couple of options yet. On those devices, hold 'Option' while turning your computer on, then select the recovery partition instead. If you're using an older Mac (from 2010 or earlier), there's a chance that you can't use Recovery Mode.

Your Mac will boot into the recovery partition. To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. If the installer opens after downloading, quit it without continuing installation. If you have a newer Mac with an Apple Silicon chip, shut down your machine, then start it up and keep the power button held down. For Mac models with an Intel processor, you'll need to reboot and start your Mac up while holding Command+R. Each macOS download is going to send to the Applications folder as an app named Install macOS version name. Your Mac's Recovery Mode is a treasure trove of useful tools, and it's the easiest way to wipe your computer and start from scratch. If you don't have the option of using the Erase Assistant, or you have a particular version of macOS that you want to install, you'll have to do things the old-fashioned way by booting into Recovery Mode (or booting from a USB drive), erasing your drive Step One: Boot From Recovery Mode or an Installer Install while your Mac is started up in safe mode.Option 2: Wipe and Reinstall macOS from Scratch Make sure that your Mac has a working and stable internet connection. Check your internet connectionĮven if you're not installing macOS from the internet, the installer needs the internet to get firmware and other information specific to your Mac. The other solutions here are organized starting with the easiest. If the message says that your Mac doesn't have enough storage space, learn how to free up storage space.

Now click Transfer or Reset > Erase All Contents and Settings. If the message recommends a solution, such as to redownload the installer and try again, please try that first. Open the System Settings app on your Mac. The cause of messages like these can vary, and sometimes they are only temporary. The message might say that an error occurred while downloading, preparing, or installing, or that the installer is damaged or could not be verified. If an error occurred while updating or installing macOS

For mac instal R-Wipe & Clean 20.0.2410