AT90USB647 drive not found, FlIP USB can't open,

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Hi, 

 

I try to reprogramming AT90USB647 chip using FLIP on Windows 10, on the Device Manager of PC, the device shows "AT90USB64" and a yellow triangle. 

I try to update the drive, but it said "the best drive already installed", but still has yellow triangle there. 

 

When I use FLIP and choose the device, and try to connect USB port, it shows USB port can't open. 

 

Please help me to solve the problems. 

 

When I use another chip, AT90USB1287, all works well, so I am sure it is a drive problem.  

 
Thanks, 

junp