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I am looking for Speaker craft MZC-64 transfer cable, 3.5mm (4conductor)plug to DB9 serial adapter, for firmware upgrade and programming MZC 64 through EZ tools. I am unable to find it online. Does anyone have the cable or know the connection points from 3.5mm to DB9 pins for making the transfer cable? And also simple wiring from 3.5mm(TRRS) to DB9 works?

Thanks

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