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UCD90SEQ64EVM-650: No USB Attach UCD90SEQ-650 ( No driver, unkown device on PC)

Part Number: UCD90SEQ64EVM-650
Other Parts Discussed in Thread: USB-TO-GPIO

Hi everyone,

I bought a kit developement board UCD90SEQ-650. Before it operated good, but now when I connect usb to PC a green light ( USB atttach) isn't on. And PC notify Unkown device. Please help me fix that! Thank you so much.