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TLV320AIC3263EVM-U: TLV320AIC3263EVM-U not recongnized via USB

Part Number: TLV320AIC3263EVM-U

Hello,

I'm working in a lab at university and right now I'm starting to use the TLV320AIC3263EVM-U Eval-Board.
I've never used another TI-Codec before so I haven't much experience by now.

Earlier this day I worked with the Board and everything seemed to work fine.
During a break I unplugged the device from my PC.

When I came back I plugged it back into the USB-Port of my Computer but the device wasn't recognized anymore.
I retried it several times but it didn't work. Neither with Codec Control nor with PurePath Studio I'm able to get a connection to the codec.

Additionally the 2 LEDS next to the TAS1020B are not glowing anymore.
I'm quite sure they were glowing before.

Is there any way to recover the Codec-Board?
I tried the DFUTest.exe from the USBfirmware_V0304_Portable package but it says that there is no DFU-Device found.

Would be great if somebody could help me with my issue.

Thanks in advance
Onur