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. Follow the prompts to select your freshly erased drive as the destination [2, 33]. Troubleshooting Certificate Errors

Plug the USB into the target Mac. Restart the Mac and immediately hold down the Option ( ) key . Select the "Install macOS Catalina" volume. Restart the Mac and immediately hold down the Option ( ) key

, you need to turn a USB flash drive (at least 16GB) into a bootable installer. Connect your USB drive and rename it to and paste the following command: Connect your USB drive and rename it to

To perform a clean installation, you need a USB flash drive (at least 16GB) to turn into a bootable installer. Download the Installer: Ensure the "Install macOS Catalina" app is in your /Applications Format the USB: Disk Utility , select your USB drive, and format it as Mac OS Extended (Journaled) with a GUID Partition Map. Name it "Catalina". Create Installer: select your USB drive

Once your bootable USB is ready: