[werk_ag]

I think that after a windows update, I can't connect my receiver.

If your problems just start after a windows update, I don't believe your arduino is broken.

Which COM port your receiver was using before the upgrade?
It is now used by any other of your arduinos?

When you connect the receiver, is it shown on windows device manager (even if as an unknow device)?

By the way the Arduino Nano for the PRO2 boards are also Arduino Nano V.3 with fdti chip or can I use also Arduino Nano V.3 with CH340G Module.

I have not tested yet, any arduino with the new chipset, so I only can say that the ones with the FTDI chipset work without problems.

EDITED (24-10-2014): Due to what I consider a dirty move from FTDI (read two topics below), I will do my best to test WeatherDuino Pro2 with arduinos without the FTDI chipset, and no more recommend using arduinos with chipsets from a company, that in their legal right to fight agains piracy, decide to do it penalizing the final consumer.