unable to flash micropython to esp 32: open serial error

[apollo]

hello dear community, 

the issue: flashing MicroPython to ESP32 with ESP-Tool.py  does not work 


issue: unable to flash micropython to esp 32: open serial error, please try again. hope to connect internet and try again.
pretty new to micropython - want to flash micropython to esp 32 ( resp 8266) board.
cf this docs: https://maker.pro/esp8266/tutorial/using...h-upycraft
 
getting this errors all the time.

open serial error, please try again.
hope to connect internet and try again.
current version only open py txt json ini file.
hope to connect internet and try again.
hope to connect internet and try again.

any idea;


update: - tried it with the so called esp-tool: 

took this tool - here https://github.com/espressif/esptool

It works on Windows, Mac OS X, and Linux. For the official documentation, you can visit the esptool.py GitHub page.
Finding the Serial Port Name
Connect your board to your computer.
Open the Arduino IDE.

Go to Tools > Port.
Save your ESP8266 serial port name (in our case it's COM4)
Close your Arduino IDE software.

cf: https://randomnerdtutorials.com/flashing...2-esp8266/

[quote]Installing esptool.py in your computer
To work with esptool.py, you’ll need either Python 2.7, Python 3.4 or a newer Python installation on your system. We recommend using Python 3.7.X, so go to Python’s website and install it in your computer.
With Python 3 installed, open a Terminal window and install the latest stable esptool.py release with pip:
pip install esptool

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. Alle Rechte vorbehalten.
[code]
C:\Users\Kasper>pip install esptool
Collecting esptool
  Downloading https://files.pythonhosted.org/packages/6c/bf/578443af2270ebeff78f
dfd30cef3a02433cc63b34a912936653a48526dd/esptool-2.7.tar.gz (83kB)
    100% |████████████████████████████████| 92kB 1.7MB/s
Collecting pyserial>=3.0 (from esptool)
  Downloading https://files.pythonhosted.org/packages/0d/e4/2a744dd9e3be04a0c090
7414e2a01a7c88bb3915cbe3c8cc06e209f59c30/pyserial-3.4-py2.py3-none-any.whl (193k
B)
    100% |████████████████████████████████| 194kB 4.3MB/s
Collecting pyaes (from esptool)
  Downloading https://files.pythonhosted.org/packages/44/66/2c17bae31c9066137957
11fc78045c285048168919ace2220daa372c7d72/pyaes-1.6.1.tar.gz
Collecting ecdsa (from esptool)
  Downloading https://files.pythonhosted.org/packages/23/a8/8aa68e70959e1287da91
54e5164bb8bd5dd7025e41ae54e8d177b8d165c9/ecdsa-0.13.2-py2.py3-none-any.whl (59kB
)
    100% |████████████████████████████████| 61kB 7.7MB/s
Installing collected packages: pyserial, pyaes, ecdsa, esptool
Could not install packages due to an EnvironmentError: [WinError 5] Zugriff verw
eigert: 'c:\\program files\\python37\\Lib\\site-packages\\pyserial-3.4.dist-info
'
Consider using the `--user` option or check the permissions.

You are using pip version 10.0.1, however version 19.2.3 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' comm
and.

C:\Users\Kasper>

run into user permission issues i guess ... 

allways thought that i have admin-rights on this machine!?

any idea