@fakhrullahs: could you post yor code and some information about your environment? Perhaps we can then find what's wrong.

@lbernstone: that did the trick - thanks again for getting me on track. I can now use my DFRobot Beetle ESP32-C6 in low power mode.

[slightly off topic]
In case anyone is interested: here is my code for a motion detector sending alarms via ESP NOW.
I expect a runtime of several days with a 500mAh ...

@iisfaq: I followed your guide and was now able to select the DFRobot Firebeetle C6 board and run your code example.

Unfortunately, regardless of what I try, the board never wakes up (just as you describe). Even worse, I cannot use deep sleep either.
I tried the suggestion from @boarchuz and moved ...

I should have mentioned that I want to test sleep modes on DFRobot C6 boards.
So my question is which toolchain does provide support (including sleep functions) for Beetle 2 ESP32 C6 or Firebeetle 2 ESP32 C6.

@iisfaq: in your initial post, esp_wifi is included in your code. You mention that you use ...

May I ask how you added the library esp_wifi.h to Arduino IDE? The library documentation shows it belongs to esp-idf.

I am looking for a way to test sleep modes with DFRobot Beetle or Firebeetle. Platformio does not seem to support the boards yet (it only supports stable versions of esp-idf ...