I think you might be using a different version of esptool.py.
4M = 32 mBit so you could try 32m-c1
32m-c1
@Wilberforce started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
I think you might be using a different version of esptool.py.
4M = 32 mBit so you could try
32m-c1