Enter sudo before the rest. May 1, at am. All other modes gives error where it downloaded. Get more of our great Apple tips, tricks, and important I can get any macOS operating on it again, please!?. Marcus Paulo Silva says:.
Now you have the installer on the external drive you can use that to install copies of macOS on multiple Macs as long as the Macs are supported by that version. A bootable installer doesn't download macOS, but it does need an internet connection to get firmware and other information for this Mac model. If Terminal can't erase successfully, use Disk Utility to erase the volume using Mac OS Extended Journaled format, then start again from the beginning. After the volume is erased, you might see an alert that Terminal would like to access files on a removable volume. Open Terminal, which is in the Utilities folder of your Applications folder.
