ESP32 minimum setup doesn't work

[Agrume]

Hello,

I'm trying to use an esp32 module in a custom pcb board. I would like to do something like this guy: https://www.youtube.com/watch?v=J10J_7Ap6Oo
I'm using the Arduino IDE and I'm always getting this error: "A fatal error occurred: Failed to connect to ESP32: Invalid head of packet"

I also tryed to use a DEVKITC connecting TX,RX,3.3,GND with the USB/TTL converter, same result.
I'm using this USB/TTL https://www.amazon.it/HiLetgo-CP2102-Mo ... B00LODGRV8

Can you help me?
Thanks

[Agrume]

The test with the DEVKITC works and an external uart/usb it works.

I still have problem with the single chip. I have just solder a button between IO0-ground and EN-ground. I'm pressing both of them during the program loading (both are connected to ground so) and then I'm leaving EN first and IO0 later.