TPS25751EVM: Error Flashing to Device

Part Number: TPS25751EVM

Tool/software:

Hi TI Experts, 

I need some help finding the error. 

I've installed the USBCPD_Application_Customization_Tool:

But I've also tried the other ones in the online version. The error is the same.

I checked the serial port at my PC and in the tool:

And I double checked the cable and the connection:

I tried also "Flash to device -> from current configuration" and I also exported a binary-file and tried "Flash to device from binary file". 

I also tried powering the EVM with an external power supply to VSYS. 

There is always the same error as mentioned in the beginning. 

Looking forward hearing you. 

BR Max