Thank you for the detailed guideline!
I’m a bit stuck at the step 4: It seems you have there 2 COM ports - one for JTAG, second “USB-Enhanced-SERIAL CH323” and those you then use in the configuration for upload_port and monitor_port.
But on my end I see just the first one. (There are 2 others, but they are irrelevant to the microcontroller, they exist even with the microcontroller disconnected) It looks like this:
Do you happen to know what I could be doing wrong?