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You write a bootable usb drive and format your hard-drive.
by haylel 7y ago
You write a bootable usb drive and format your hard-drive.
- acdha 7y agoThis hasn’t been necessary for many years as long as you haven’t had to replace the drive or lack an internet connection: just hold Command-R down at boot. https://support.apple.com/en-us/HT201314 https://support.apple.com/en-us/HT201314