Boot option one should be set to the Usb stick.
So should BBS priority.
If the storage boot option is set to legacy mode, make sure the option of detect usb legacy devices is set to on or enabled in your bios options.
What ever mode the usb pen can work under Oprom or uefi mode make sure the correct mode comes before the other when it is set as a boot able drive or partition.
So the order can be OProm- uefi or Uefi-Oprom.