ofelas,

Thank you for using Dell's Community Forum.

I haven’t tried it, but you can enter the BIOS and go to the second page (boot page) and select to boot off of “USB storage device”.
See if that works.

Thanks, just noticed BIOS A03 added USB butterfly compatibility, so maybe booting off one'll work.

Chip

We've done it though it is slow.  We had to set the USB emulation back.