Hello all,

I recently got a custom PCB made with ESP32-PICO-D4 as the MCU. I only have the following pins exposed outside for connecting wires

Rx, Tx, VCC, GND, IO 0(GPIO zero), and EN pins. I wanna know

1.) whether the bare IC's come with any bootloader in them such that I can directly flash programs into them using esptool?
2.) What lines do I need if I have to flash files using esp tool?
3.) What lines do I need if I need to burn the Arduino's bootloader into it?

Please let me know what should I do for performing above tasks. Thanks in advance.

 

Your best source of info is Espressif Systems themselves. Take a peek at the ESP32-PICO-KIT V4 / V4.1 Getting Started Guide to see how this thing can be programmed via a serial interface.

I believe this is a hardware function not requiring any bootloader. Of course you can add a bootloader later