Hi @m5stack you could pip install a pyserial module to solve it. I tried that but the problem persists. As a quick fix, I just flashed it using a window virtual machine. the LED always RED? which program are you use? Yes, but after I flashed the new firmware everything is behaving well. which program are you use? It turned RED, after I tried to flash it with the newer esptool (2.8) as I showed in my initial topic we will fix this bug in next version. šŸ¤žšŸ» Have a nice day