Macbook, Can't boot from USB because has no administrator in startup utility
When I was going to ReInstall a fresh copy of Catalina MacOS on my Macbook pro 2019 16 inch, unfortunately I deleted all partitions instead of erasing them. As my internet connection is so unstable as much as I repeated installing the OS from the net, it was failing with different errors usually related to the network errors or usually it says can't decode raw data.
I created a bootable media flash drive by these steps https://support.apple.com/en-au/HT201372.
Now when I want to boot the device from the USB drive,
it says "Security settings do not allow this Mac to use an external startup disk".
I waned to allow my Mac booting from external media (as this link https://support.apple.com/en-au/HT208198) but It shows me the error: "Authentication Needed - You will need to authenticate as an Administrator to change the boot security settings."
And when I click on Enter macOS Password I see this error : "Recovery is trying to change system settings. No administrator was found."
Notes:
- I had never set a password for my mac T2 security
- I had forgotten to sign out my apple id from the Macbook but I've removed my device from my apple account after that.
- The Macbook doesn't have any operating system now, so I can't use solutions like
rm /var/db/.AppleSetupDone
I've searched a lot and watched lots of youtube videos but didn't succeed anything yet. How can I fix my issue to allow me boot from the flash drive?
Solution 1:
You can try to run the installer on your USB directly in Recovery mode.
Open up terminal and run ls /volumes. Identify your USB, and then run /volumes/<USB Name>/Install\ macOS\ Catalina.app/Contents/MacOS/InstallAssistant. The macOS installer should appear.
If it did not launch, you can copy your installation partition on the USB over to your internal drive. In Disk Utility, you can create a new partition on the internal drive and "restore" the USB drive to the new partition you just created. Then, select your internal installation partition as a boot drive and proceed to standard installation.