Edit:
A warning. I was inspired to use another USB-C cable. Very strange is that with the supplied USB (black) cable the NanoVNA won't start connected to the PC.
I did a test with a self-purchased (white) USB-C cable, and guess what: the NanoVNA will now start up if it is connected to the PC when I press the PWR switch.
So be careful with the supplied USB cable.
