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Reset/recover the device, Select HCI COM port in ClientControl, Try turning Flow control OFF/ON and click on Open Port. Then choose correct HCD file of the application and click Download. You should be able to program your board.
If still this is giving too much trouble, WICED SDK is always a reliable way.
I cant try to "Try turning Flow control ON", when turn on, then click download button. The tool crashed(If flow control off, no crash at least). Because I want to upgrading module embeded on my device, I've tried WICED-Studio tool, it never success. But use client control, it success one time.