I would kindly ask for help. I am just testing CubeCell module (not a board). I connect VCC, GND, RX and TX and I would like to upload a arduino sketch. I am able to to communicate with module using at commands but unable to upload a sketch. All the time I got an error “Unhandled error: Timed out waiting for Bootloader response.”
What i am doing wrong? Is it necessary to init the ability to upload sketch somehow? like connect some pins or so?