firmware updating using RSLogix's Who Active

In RSLogix 5000, under Who Active, I can update Firmware for the CPU card and motion card. But I cannot do that for ethernet cards and I/O cards ("Update Firmware" button is grayed out). Why is that?

If you click the Help button in the Who Active popup you can read:

This button enables you to update controller firmware and certain motion module firmware only. To update firmware for any other devices, you must run the ControlFLASH application separately.

Click to expand...

I guess RSLogix has a limited access to the dll(s) used by ControlFLASH.