Failed detecting number of device connected

Hi !

I'm having trouble to connect to ADSP-21489 EZ-Kit Lite via Debug Agent, with the error code: 0x80048049 and the

message : Failed detecting number of device connected.

I have been disconnect, reconnect in any possible order but I still cannot figure out what is wrong.

OS : Windows 7 64-bits

VDSP++ version : 5.1.2

Evaluation Kit ADSP-21489 EZ-Board 0.1 : Bom Rev 1.8

Standalone Debug Agent ASZS-SADA2-BRD : Bom Rev 1.5

Sometimes, randomly, I have this : "Could not obtain the firmware version. Please shut down VisualDSP disconnect and reconnect USB on the emulator, and try again."

Or this : Error code: 0x80048047, Error description: Failed to initilize emulator.