Cannot boot to macOS bootable USB installer
Hello,
I am attempting to install macOS on a separate partition on my late 2012 Mac Mini running Catalina version 10.15.3. I have successfully partitioned my drive and created a bootable installer on a USB disk, but I cannot boot to it. When I go to startup disk in system preferences the USB does not show up as an option. Pressing the option key on restart has no affect and does not bring up the startup disk menu. I reset the NVRAM as suggested on a different website but this has not fixed my issue. How can I get around this to boot to the USB?
Thanks in advance for the advice
Mac mini, macOS 10.15