Sending FBUS command to Nokia BB5 through DKU-2

[enrox]

Hi!

I'm trying to send some FBUS command to my Nokia N70 with DKUS-2 usb cable.
The Nokia Cable Connectivity Driver installed nmwcdcls.dll to %%WINDIR%%\System32, but this dll does not export any specific function which I could use for communication with the target device.
Hence i'm trying to use in my sample C source the setupapi.dll and some Windows Api functions.

By enumerating the connected USB devices i found only "Nokia N70 USB Phone Parent" device which has the following driverkey and interfacename:
Driverkey: {4F919108-4ADF-11D5-882D-00B0D02FE381}\0000
IfName: \\?\usb#vid_0421&pid_043a#6&2a75b3e&0&1#{a5dcbf10-6530-11d2-901f-00c04fb951ed}

I'm able to open the device with the CreateFile() function, which returns a valid handle. But WriteFile() doesn't work. It returns success but the number of bytes written are zero

Could somebody help how to communicate with BB5 Nokia Phone through DKU-2 usb cable?

BR
EnRoX