Problem flashing a dev. board

Development Tools Uploading
1

I have a dev board DOITING ESP-12F. I connect it and see a serial port COM8. However when I run Upload I get an error

serial.serialutil.SerialException: could not open port 'COM8': FileNotFoundError(2, 'The system cannot find the file specified.',

What do I do wrong?

2

Go to your Control Panel, click on Device Manager, and look for COM ports. If you find one, that is more likely where your ESP-12F is connected

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3

Yes I see a com port (COM8) in Device Manager. But when I try to Upload - I get the error.
I have to buttons on board - RESET and FLASH.
My actions

  1. Press RESET then press FLASH
  2. Release RESET then release FLASH
  3. Press Upload in Arduino.
4

Make sure Serial Monitor is not open or close any terminal program (Putty, etc) accessing the COM port.

5

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