Hi there,
I know this is an old post but did you found a solution? I figured i could continu the job by removing and replacing the cable and the machine start again but still annoying…
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If you have tried everything you can on the physical side and want to try to rule out software, you can always try using MeerK@t which is an independent and different implementation of similar functionality. I don’t even own a K40 so I just think it’s amazing that two different people have independently built software workarounds for super-limited hardware. 
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