Hi Aivar,
Note: Using Thonny 3.3.13
I'm having a problem flashing the D1 Mini Pro, as I had with the NodeMCU Mini. I was able to solve the NodeMCU Mini by using a powered hub for the flashing, but so far that has not had any affect on flashing the D1Mini Pro. The D1 Mini Pro appears to employ a CH9102 for the USB-UART bridge, but apparently Windows had the driver.
Have you had any similar issues reported, and perhaps solutions.
Mick