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CC2531: Packet Sniffer Software doesn't recognize CC2531 USB Dongle Packet Sniffer

Part Number: CC2531
Other Parts Discussed in Thread: Z-STACK

I have upload "sniffer_fw_cc2531.hex" file for packet sniffing to my CC2531 USB Dongle. After uploading the HEX file, Packet Sniffer is not recognizing the USB Dongle thus I'm unable to sniff data. 

Anyone can tell me a way to solve this problem?