Looks like the production batch of the newest developer tools, v.10.2020 Developer Tools, shipped with a cable that need fixing . Two wires got reversed, but luckily there is a quick fix. The Serial board has a Red/Yellow/Blue cable attached to it and we can fix the cable with some scissors and tape.
- Simply cutting the Yellow and Blue wires (not the red one, never cut the red wire )
- Strip the Yellow and Blue wire ends (4 in total)
- Twist the Yellow with Blue and then Blue with Yellow
- Tape over those two new connections (ideally with electrical tape)
That should do the trick. We’ll post more materials soon, but this will explain why the Serial connection has not yet been working.
Here is a video of the fixed wire working with the Serial Port.