File transfer using serial connection
rshellhas launched, connect with:
> connect serial /dev/ttyACM0 115200
By the way,
ACMstands for «asynchronous communication mechanism».
Yes, I do agree with you. Ampy is the best option when you don't want to use or you can not use Pymakr (due to unsupported Linux distribution).
You might want to have a look at https://forum.pycom.io/topic/93/updating-firmware-via-serial-usb