driveri v0.71 su dobri. par ljudi je imalo taj "INF" poblem i svi su riješili na slj način.
lijen sam pa mi se neda prevađati:

checked BIOS, enabled two COM ports, made sure there are no conflicts, installed MPM for CX65, extracted the DCA-540 drivers somewhere. Then I rebooted, removed the "siemens mobile phone usb modem", unplugged and plugged the cable again. It found new hardware, installed the driver "siemens mobile phone usb modem" again but this time correctly. Now it works.