unfortunately the designer (Jesse Marroquin) seems to have abandoned the project. I tried to reach him via email... but if the address is still up to date. In any case, he cannot be reached via the project. Github also doesn't allow messages. I'm not familiar with that either. The change with the cable is a missing connection to the RESET on the Z8. However, I can't imagine why a resistor parallel to the capacitor at the RESET should be good. Unfortunately, my efforts to provide the Z8 with the firmware have not been successful so far. Of course, things could have gone wrong during assembly. Almost looks like a total loss. I thank you for your contribution.