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Hi Eduard,
I assume that you have set both K6s the same.
If the microphone input were blocked, you should still hear on the recording that you are tapping the housing with a hard object. The microphone input is a small hole, so it can quickly become clogged with dirt.
You could still perform a hard reset:- Switch on the K6
- Press and hold the power button for a long time (about 30 seconds)
- The red LED flashes 2x and then goes out again
- Restart the K6, K6 has been reset to factory settings.
If necessary, flash the firmware again after this reset. If you still have no sound, then I think there really is a technical problem with the microphone.