This will restore the OS X version your Mac came with.Īfter rebooting and configuring your Mac open App Store, download and install Mac OS X Mavericks (if an older OS X version was installed previously). ![]() Open Restore OS X and restore the original OS X. Then retry to erase the disk with Disk Utility. Sometimes Disk Utility won't allow you to erase the internal disk: open Terminal and enter diskutil umountDisk /dev/disk0 and dd if=/dev/zero of=/dev/disk0 bs=512 count=1. Open Disk Utility and partition your internal disk: GUID partition scheme (use the "Options." button at the bottom of the main pane for this), one partition, journaled HFS+. ![]() On a 50 Mbps-line it takes about 4 min (presenting a small animated globe) to boot to the Recovery Netboot image which is loaded from an Apple/Akamai server. In a few words you need the latest firmware update installed, either ethernet or WLAN (WPA/WPA2) and a router with DHCP activated for a successful internet recovery. Moreover, you can also choose other available options to get Mac recovery mode disk utilities and other features. ![]() As a result, you can boot Mac to recovery mode. Choose the second Reinstall macOS option. The prerequisites for an Internet Recovery are listed here: Recovery/Internet Recovery. You will receive a popping-up window with the name of macOS Utilities. You can restore OS X in Internet Recovery Mode if you have a newer Mac:īoot to Internet Recovery Mode by pressing alt cmd R.
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