crwdns2893792:0crwdne2893792:0 revher ,
crwdns2893800:0crwdne2893800:0:
Your external device should be recognized by the "Bios" or "UEFI" at startup. You can probably click on Esc at startup and ask to boot from you external device.
crwdns2892198:0crwdne2892198:0:
open