I have modified configs via X-CTU several times and been all over for info to no avail.
In X-CTU, in the Terminal with jumper from Tx to Rx on the receiver XBee
Which things have you changed? To what? How are you connecting the XBee to the PC to use X-CTU?
With the TX and RX pins hardwired together, the XBee is sitting on the sidelines doing nothing. This was not a useful exercise.