![]() In regards to the Internet Recovery method, mentioned in the comments, that will recover you to the OS that was last installed on the Mac, not install a new one. That step was left out of the instructions. ![]() To be able to boot off the external drive you have to authenticate as an administrator. (My 2019 MacBook Pro among them) On those units, the T2 controls the ability to boot from an external drive. I am not sure the process in the article works with any of the T2 security chip Macs. (Thanks to Angus for the new Terminal command!) When you hear the boot tone, hold down the Option (⌥) key and follow the three steps above. To install Catalina on another Mac, first make sure it's powered off, then simply plug in the USB installer you created and turn the Mac on. ![]() When your Mac's startup disk is formatted, return to the Utilities window and select Install macOS, choose your freshly erased startup drive when asked where to install the OS, and follow the onscreen prompts to complete the installation.Once the USB drive has booted, select Disk Utility from the Utilities window, choose your Mac's startup drive from the list, and click Erase.Use the mouse pointer or the arrow keys on your keyboard to select the disk called Install macOS Catalina in the drive list that appears on the screen.To do so, restart your Mac and hold down the Option (⌥) key as soon as you hear the reboot tone. You can install Catalina on your Mac as soon as the USB installer has been created. This will take a few minutes to complete, so leave it running until you see the message "Install media now available." Note that if you're asked whether you want to install Xcode during the process, you can safely click Not Now and the process will complete successfully regardless. Type Y and press Enter when prompted, and the command will create your bootable Catalina installer on the USB drive.Enter your administrator password when prompted.Once you've replaced XXXXX in the last step with the name of the USB drive, press the Enter key on your keyboard to run the completed Terminal command.Still in the Terminal window, type /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia -volume /Volumes/XXXXX but replace XXXXX with the name of the USB drive you intend to use as a bootable installer. ![]()
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