Bill, can you measure the current draw when you turn on the qmx?? If it is waiting for firmware,? it should be about 200mA, maybe a bit more at 7V.? If it is much less than that, or way more, there is likely a problem to resolve before it will mount the USB drive.
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You could also verify your cable setup to make sure it supports data transfer by plugging it into another device like a camera or card reader or whatever.? ?Some cables? and adapters only support power/charging.
