I had CC2531 flashed with RNP example and working as USB to Serial Port device with CDC driver.
Device was installed under Windows and I used Linux Ubuntu virtual machine for RNP Host application where USB is recognized as /dev/ttyACM0.
After few days and re-installation of RemoTI SDK, USB Dongle is now recognized as HID device by windows, and I dont know how to make windows forget it, and offer New Hardware Wizard to install with other driver?