Inspiron 15 (3537) BTX Base no usb boot option..

I have a dell Inspiron 15 (3537) BTX Base with bios A06, in the bios i don't see any

option to boot from usb. I have tried in both legacy mode and UFEI mode, here is what i have tried..

1. Add boot option in UFEI mode and called it USB, selected view boot option properties, both fields 

in that option are blank with nothing to select.

2. Have all drivers from dell website installed.

If anyone has this option to boot from usb, can you post a image of your bios setup for boot or

is boot from usb not available for this model of laptop.