ESP32 Forum

The ESP32-c3 was working properly on the flashed code, and suddenly the flashed code stopped working. On trying to again flash the code, this error occured : Failed to connect to ESP32-C3: No serial data received.

Tried to solve this error by resetting, rebooting , Using python script to flash bootloader manually by script, used ESP IDF to reconfigure and tried to flash the bootloader.Also checked all the possible reasons for this error to occur, like the checking power supply, changed the USB connecting wire, checking the hardware etc, but everything was fine.

The hardware is completely fine, and the device is being recognized, but it is not receiving any serial data.

Also tried to flash the bootloader using USB to TTL converter, but still it is not receiving any data, and there is no response.

What can be the issue, and how to troubleshoot this?

What hardware is this on?

I am using ESP32 C3 mini 1U, and connecting it through my laptop(Infinix Inbook - windows 11)

Just to check: were you ever able to flash and run a program on that board? Asking because there's known dud versions of that board around that have an ESP32-C3 without internal flash. You can check the type number on the ESP32 chip, see if it has something like '-FN4' on it; if not, yours doesn't have internal flash.

Also tried to flash the bootloader using USB to TTL converter, but still it is not receiving any data, and there is no response.

If you reset with IO8 pulled up and IO9 pulled down, the device will enter SPI FLASH write mode.

If you reset with IO9 pulled up, the device will boot from the SPI Flash regardless of the state of IO8.