Hey guys,
I found a solution to the problem. It was previously answered on the forum:
Excalbian:
After opening a support ticket with Digi (they directed me to update the firmware which also didn’t work), someone else (on an R/C UAV forum) suggested that a solution he’s found is to short out the diode in front of Din. Sure enough, as soon as that was done, not only could I read and write the module from XCTU but it worked with the other module as a transceiver.
So I did just that, shorted out the diode in front of DIN on the Sparkfun Explorer Regulated (for some reason the placement of the diode was either improper or not necessary-most likely placed in the wrong direction).
It works!