- Remove NodeMCU from development PC's USB port
- Install the correct firmware for the used on-board USB -> UART convertor (either a CH340g or a CP2102).
- Connect USB to development PC
- Make a note of the assigned COM-port (if not shown, or the dialogbox went away too fast, look for the number in the "Device Manager" under "Ports (COM & LPT)")
- Start up the Arduino IDE and under "Tools" select:
- Board: NodeMCU (any version will work)
- Port: <The COM-port you just made a note of>
- It should work now