Flashing Drives Connected To Usb2.0

Hi…
Just tried to update my drives firmware but they all failed to detect the drive…

I’ve a Compaq EVO n1020v and 2 external cases connected to the USB 2.0 ports…

Case 1
ASUS DVD-ROM E616

Case 2
PIONEER A05 DVD-RW

How can I flash it without having to connect to a PC using IDE connections?

PLEASE HELP

You cannot flash the Asus this way AFAIK, but the Pioneer should be flashable in an external case…