xbee pro s2, please help :(

I have a problem with my xbee pro T s2
I find the USB-SERIAL CH340 in the list when i open XCTU

but it says that it is unable to communicate with modem
i tried to reset it but this didn't work
how can this be solved

same problem for me with Arduino Mega/xbee shield v2.0 and xbee S1.
Tried to use D10 and D11 for RX and TX but nothing works.
Xctu always display "please reset" screen
Using code is not effective, the serial doesn't respond.
If you find a solution, I would be glad to read it :slight_smile: