USB not detected

Hi, 

My friend sent me his code, I change the code a little bit in his flash memory, protocol, variable, function and more.

After compile I not seeing any errors or warnings.

but when I uploading the code to my board, the computer is not detecting my USB (there isnt normal voice of connecting USB, or information in device manger).

when i uploading his original code. the computer detecting the device.

what i made wrong?

what in my changes could interrupt to detect USB?

Where should i check?

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