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USB communication failure ADAU 1701 Sigma Studio

Hi,

I recently bought a wondom amp2 (a DSP module with the ADAU 1701 chip) and the wondom ICP3 usb programmer.

When I received the products I made a simple Crossover to try the module out. After that I wanted to upload the sketch to the board, but I always received a massage saying that a USB communication error has occurred. This happened even though the boards were recognized by sigma studio and connected in the right order and way. 

The last few days I tried the same thing on different PCs with Windows 7 and 10 but I always got the same results. Also I tried to install different drivers, but that also didn't work. 

I hope somebody can help me. Thanks in advance.