Problems with DOS Dude
I have a similar problem. My USB bootable flash drive shows on boot screen, but the system doesn't boot from the flash drive.
I have been trying to install Catalina via dosdude patch, but it asks for SIP disabled. I cannot access Recovery mode. I have tried disabling SIP via single user mode, with no success.
I am on a Macbook Pro 2009 running El Capitan, but it has already ran Mojave with the patcher.
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