EBB42 v1.2 via DFU

I am trying to configure an Octopus 11 with an EBB42 v1.2 toolboard but cannot seem to get the toolboard into DFU mode. I have connected the toolboard to the Pi via USB. I have inserted the jumber on the VBUS pins. I have rebooted the Pi several times. There are no illuminated LEDs on the toolboard. The RatOS configurator stays at "Waiting for DFU. Am I missing something? Do I have a bad toolboard?
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