@mrconstanti, I found on Win 11 don't work really the USB / Serial driver from M5Stack. I found after some own Trouble with can't find device the driver developer with an update driver also for Win 11. (Driver year 2025) I test, unknown device still exist, but I think with Arduino IDE can work, until now my own project stopped with some other errors, so I'm not sure to 100% but if help other and you. wch-ic.com Kind regards Chris