X-CTU manual

Is there a manual available for X-CTU? I’m programming XBee 802.15.4 OEM radios so I’m especially interested in the XBee modem drop down list and the Function Set drop down list.

Yes there is. Here is one of the places it can be found, which is the Documentation page for 802.15.4 adapters:
http://www.digi.com/support/productdetl.jsp?pid=3130&osvid=0&s=358&tp=3

The manual is called “X-CTU Configuration & Test Utility Software User Guide”.

Hi,

X-CTU Next Gen can be found in the following link, http://www.digi.com/support/productdetail?pid=3352
You can see the Help Contents in X-CTU Next Gen for more information.

What you are looking for is not a manual for XCTU but the Manual for the XBee 802.15.4 modules. That is where you will find the information about the firmware versions and all of the related commands. You can locate that at http://www.digi.com/support/productdetail?pid=3257

The most up-to-date XCTU documentation is available at http://www.digi.com/resources/documentation/digidocs/90001458-13/default.htm.