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Unfortunately the debug output of the Karma requires that a special piece of custom hardware be soldered into the base station. And anyway, if it's the problem I'm thinking of, we've already been through that route and narrowed it down to a hardware component.

A quick poke inside the dock shows 4 pads on the PCB which appear to be a 3.3V serial port so you just need a level converter. A MAX3323 would do it or one of the many 3.3V compliant USB mobile phone cables.