I found out why my Nokta Legend broke. When I inserted the headphone adapter, it turned off and did not turn on again. An autopsy showed a short circuit in the stm32f765 controller. I copied part of the circuit and found out that the leg of the headphone jack. It goes through resistor r73 (1k), directly to the 97th leg of the controller. There is no protection against static voltage. You can’t do this, I don’t know why the Nokta engineers acted so badly.