what are the symptoms? when the shutdown occurs, do the LEDs of the board continue to light?

U need to start your esp32 with Low level on Boot pin for begin bootloader.In normal mode u can hold HIGH level on this pin by pullup him with 10k, for example. Usually u can use 2 buttons for switching mode, 1 - for connect boot pin to GND, 2 - for pull RST(EN) pin to GND - for restarting esp32(u n...

Maybe I didn't understand something, but why can't you just compare mac addresses? they seem to be unique, more or less.

#include <WiFi.h>
Serial.println(WiFi.macAddress());

Im use ESP32-WROVER board, connect main pins like VDD, GND, EN by official documentation (capacitors and etc.). From source my board take 5 volts, then i use LM1117 -3.3 to power supply. About EN pin - i have 10k resistor for pullup it to 3.3 volts and 0.1 mF capacitor , as usual, and after solderin...