C3-Mini

For flashing C3-Mini successfully, you need to hold the BOOT-Button, click in parallel the RST-Button for a moment while still keeping BOOT button pressed and then start WebFlashing. Once Flashing started you can release the BOOT-Button. Whenever you want to quick change a sensor, do the same procedure. We know this is tedious, compared to old ESP8266 / ESP32 boards. Therefore we work on convenience measures against it.