I had to do a forced firmware download today, and found that I could only do it if the cable from the computer went directly to ACC 1 on the KX3. If you have a PX3 connected, unplug the cable from the PX3, turn off the PX3, and connect the KX3's ACC 1 socket directly to the computer using the supplied cable.
I found this out by trial and error. My user manual (Rev C5) does not mention this required step.
73 Ray W2RS
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