A youtuber has developed a lighting system for staircases using the ESP32 module, the RD D03E mmWave radar sensor, and the ...
The live GPIO pin monitoring library sets up the ESP32 to stream information about what all of the pins are doing in real time to a webserver, which displays the information as a helpful graphic.
It looks like whatever boot ROM the ESP32 has inside it is testing for a high voltage on GPIO 12. Don’t ask us. Anyway, the short version of the story is: pull GPIO 12 high and hit reset.