Then booted from the USB drive again, formatted the drive again, rebooted and used internet recovery to install the last installed version of the OS which now was Catalina. Then I installed Catalina over that fresh install of Mojave. DiskMaker X erases everything on the drive when you create the bootable macOS Catalina installation drive, so if you’re planning to use the same drive for other utilities or troubleshooting tools, or perhaps use it as a backup drive, do that after you’ve created the bootable installation drive. What I ended up having to do was the Internet Recovery method, which is how I know it will only allow you to install the last installed OS. ![]() (Only a small amount of panic at this point) Erased boot drive so no known administrators, so no way to boot off the USB drive. One more thing, if you erase the main drive and then reboot with a T2 Mac you will have to authenticate as an administrator as I already mentioned to boot off the USB drive, but the Mac looks at the boot drive for administrators that you can log into the security menu to boot from the external drive. 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. On those units, the T2 controls the ability to boot from an external drive. I went thru all the steps but it never told me if it was successful or not. ![]() I am not sure the process in the article works with any of the T2 security chip Macs. I downloaded the program but I cannot tell if it created the bootable disk.
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