Arduino, xbee shield, xbee : nothing is working :(

Hi folks,

I'm currently trying to use xbee with my arduino and I'm facing some troubles.
I have an arduino mega 2560 with and xbee shield V2.0 on it and a xbee S1 (XB24 model) plugged on it.
Jumper RX set to the line 3
Jumper TX set to the line 2

I've tried to use and configure XCTU but everytime I try to connect or to scan for my xbee, tt tells me to reset the xbee. I, then, push the reset button for 1 second and release it. Still have the popup window that ask me to reset the shield...
Same thing with recovery.

I've also tried to read data from it with a simple program through arduino mega (using softwareserial library) but stil nothing, serial.available is still false.

I really don't know what I missed and where I would have to go.
Does anyone have a clue please ?

Regards
Steeve