Here's what the seller had to say:

I thought about that too, but I must assume it was not flashed in a PDQ. I got it with some WallStreets a while back, and at least two of those were not PDQs. If I had a PDQ, I'd test it out, but I don't.

Click to expand...

So it is highly likely it was flashed on a pre-PDQ machine. I therefore am unwilling to take a $120 + $60 (shipping) risk that it "might" work, nor am I willing to spend time to figure out how to restore the Sonnet card's ROM to its pre-flashed state. But perhaps one among us here is willing to do that. Simply refer to the Amazon link I posted before to purchase. And return here to let us know what happens!