Help me boot m570ru off USB...... (blindly)

So uh...

I have a m570ru here with a failed video card.

The failed card is was a 8700m GT...
So basically the BIOS version it has right now is probably one of the earliest and it doesn't support any cards I have.
So I have to update the BIOS/EC blindly.

All this would be fine.
Except for the fact that USB drive seems to be excluded from the boot order.
Can someone with a m570ru give me an idea of how I could set USB boot to priority in the BIOS, totally blindly?

Thanks.

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