It is possible to perform reverse conversion from DLN-2-U2C to DLN-2 adapter.
In this case, you need to download DLN Firmware Update (fw_update.exe) application from the Downloads section of the www.dlnware.com web site. Then close JP4 jumper on the board, plug-in board to USB, open JP4 jumper and run fw_update.exe. Choose latest available firmware version of DLN-2 adapter and press Upload button.
Now you have original DLN-2 adapter which uses DLN driver and software.