Hello @mb M5Atom Matrix has a dedicated USB-Serial chip which is not affected by the ESP32 reset and thus is keeping the serial connection alive. In contrast the ESP32S3 inside M5AtomS3 Lite has USB built-in (and doesn't need a dedicated USB-Serial chip). The 'downside' being what you observe - resetting ESP32S3 also resets the USB connection. Thanks Felix

It appears that ENABLE is indeed the RESET pin. I use it to connect SPI OLED RESET signals, and that works.