i checked 1-6 and it DOES NOT confirm or deny the question
(my advice is: dont do it if you can't afford to brick the board. call asus.)
i can say on my older ancient MSI board (usb 3.0a?) that "powered usb 3.0" is only supported after booting win10 and activating (driver/software activation). damage can occur otherwise to the usb port itself.
(as for usb-c i do not know if that requires drivers. as to flashbios - that might be true might not. it would required advance planning - it would not work by luck)
how many watts does the board say it consumes?
how many watts does the MB manual say these (usb 3.1?) handle each?
i would bet the initial indications are: will burn out, amps/watts don't match
(is cpu installed? will it be a consumer? can you update if no cpu is installed? and so on.)