I am using Windows 10 and tried a serial connection in putty every time as well after flashing the device.
Yes I verified the baud rate both in the Espruino web ide and in putty.
And after every time I flashed the device I tried to connect with both the web IDE and a serial connection in putty and then power cycle the device (disconnect from the usb). Still nothing. I am assuming that I am getting the wrong addresses in the flashing process but I have tried every set of addresses I have seen. I have not tried to downgrade the version though. Will try that.
Try to connect firs from terminal. Eg minicom in linux