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. Make sure to back up all your important files, because you'll never be able to recover them after this method.This is spec. It takes about 15-30 minutes, depending on your configuration. Then retry to erase the disk with Disk Utility. Select the Mac partition as the destination (whatever you named it, Lion, or Mac HD), and let it install. 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. The prerequisites for an Internet Recovery are listed here: Recovery/Internet Recovery. 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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