I’ll admit I’m a little confused. We may be talking past each other. I’m not installing to the hard drive, just the USB, and the USB won’t boot unless I switch to UEFI, which breaks Windows. I hadn’t even heard of UEFI when I created the USB, so the laptop was still set for CSM at that time.
I haven’t found any indication that CSM vs UEFI is a setting in unetbootin, so I have no idea where to change that. I did find one thread at their Github that implies it’s set in the original ISO, which is why I thought that was where it had to be handled:
Am I making sense? I hope?