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CC2540 USB Dongle driver installation fails

Other Parts Discussed in Thread: CC2540

Hi,

I flashed the USB Dongle with the firmware CC2540_USBdongle_HostTestRelease_All.hex.
After that I followed the steps described in 3.1 CC25540 Mini Development Kit User Guide.

Choosing the driver placed in C:\Texas Instruments\BLE-CC254x-1.2.1\Accessories\Drivers gives me a error message:

Driver software has been found, but during Installation a Failure occurs. The System cannot find the mentioned file.

In the Folder Drivers is only this file: usb_cdc_driver_cc2540.inf
Do I need some other files ? Please help me.

I have Windows Vista 64bit version.

Thanks

Robin