I guess it is not possible.. Found this article on vendor site
https://www.transcend-info.com/Support/FAQ-409
"- Can the JetFlash be used as a bootable flash drive?"
"JetFlash series aims at being a portable storage device and not as a
bootable drive. No exclusive software tool is provided
I'm having problems with USB boot from Transcend JetFlash 620 drive 32GB.
SeaBIOS doesn't see it as boot device. I suppose the problem is in
SecureDrive technology that is used on this device. I tried to remove it
with "CD-ROM Remover_v1.0.0.3" tool that I've found. It removed CD partition
from
