COM port busy after "WiFi.begin ();" I'm unable to upload new sketches or Monitor serial when this funtion is called in my code. The only way I can is by booting the board with Boot button held, ...

Wait for the Device Manager tree to reload. Connect the USB cable of the Arduino board to your computer. Wait for the "USB-SERIAL CH340 (COM_n_)" port to reappear under the "Ports (COM & LPT)" section ...

If you get an "Unable to open a connection to com1" message, you won't be able to use your serial port. Follow this guide to fix it fast.