The USB boot option will appear when a manual boot (F12 at powerup) is choses, AND there's a UEFI-bootable flash drive attached to the system. There are many ways to prepare these -- Macrium Reflect is one of the best image/backup/recovery packages for doing the job.  
i understand legacy boot is not available in my 3410, but how would I boot from an iso image if my ssd failed?  there is no usb option.  there is a boot from SD option but this doent appear to work either.   I know I could purchase another SSD and clone my current disc, but this seem like an expensive option I may never use.   Regards
uefi boot option