Hi,

I just tested esp-at firmware followed this instruction: https://github.com/espressif/esp-at/blob/master/docs/ESP_AT_Get_Started.md

Same result:

tom@ubuntu:~/esp32/esp-at$ make flash
Makefile:36: There is no module_config/module_wroom-32,Using module_config/module_esp32_default
/home/tom ...

Hello,

I was able to erase my ESP32_Devkitc_V4 with ESP32-WROOM-32D module, however I'm not able to get one to work again.
I followed the https://docs.espressif.com/projects/esp-idf/en/v4.0-beta2/get-started/index.html

Flashing result:

$ idf.py -p /dev/ttyUSB0 flash
Checking Python dependencies ...