macOS Catalina Patcher. Download and instructions available at http://dosdude1.com/catalina pic.twitter.com/5P6udnA3Rv
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System firmware is not up to date. This is explained on the Important Info section of the webpage.
I am in the same boat. Unable to boot to drive. Had Mojave installed on a Mac Mini 4,1 just fine but didn't realize the Mac Mini 4,1 was affected by this. Is there a way to apply the patch on the installing screen?
Was able to resolve this issue and install by running the firmware update file from a separate usb via the installer command in the terminal.
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