[pierrelux]

Thanks for your answers;
Maybe it's a coincidence that's my receiver doesn't work after the windows uopdate.
I try different connections:
1.- Arduino Ide with Arduino Uno connection everything is OK, I found the Uno connected to Com Port 11.
Device manager Arduino Uno (COM 11) connected and other devices : FT232 USB UART.
LED L blinking.
2.- Arduino Ide with Arduino Nano (with CH340G chip, like Uncle Bob, brought the Nano with the CH340G by mistake) changing the board type in Nano ATmega 328 it's connected to Com Port 12.
Device manager : USB SERIAL CH340 (COM 12). LED L is flashing.
3.- Arduino Ide with the receiver board, board type Nano ATmega 328, port is greyed.
Device manager : no Com Port connected and other devices : FT232 USB UART yellow triangle with "!" inside. LED L blink only when i connect the USB Cable
I have ordered a new Adrduino Nano V. 3 with a ftdi chip and will wait for further investigations because I am not an Arduino specialist.
I am waiting female pin headers, so I can easily change the Arduino Nano from the board. I will do the same with the PRO2 boards.
Thanks for your help, when I receive the new Arduino board I will keep you informed.