How auspicious! As I was typing my last message, DHL was putting the box on my porch. The new code works on a Raspberry Pi4 running Ubuntu Mate 20.04. When you switch the board to 2.1, it works. When you switch to Original, it ceases to operate. I noticed no overheat issue.
... I don't know...but personally, I would have been hard-pressed not to name the buttons, "Original" and "Extra Crispy."