Hmm. I've used tc-install to create a bootable USB, but in legacy mode the USB is not recognized. Does that mean I've made some mistake with tc-install?
Or is the legacy mode of my hardware to blame?
Is there a way to check whether the USB should work, other than boot and test?
How exactly did you create that USB drive ?
What options did you choose ?
Did you wipe out the USB ?
Did you deploy a bootloader ?
Did you mark partition as bootable ?