ATMEGA16U2 DFU Windows

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I'm trying to update firmware on a MEGA2560 R3 board with an ATMEGA16U2 USB controller. I've been able to short the reset and ground pins so that the board disappears from the serial ports but when I run flip and try to open the usb connection after selecting the device, it says "Could not open USB device". I'm not too sure how to proceed from here.

This is all an effort to solve a write issue as described in this post. Any help or advice would be great. I have downloaded the relevant firmware .hex file, I just need to get it on the board...

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I suspect that your 16U2 is damaged. If you're sure that it's not due to mistakes that you made (see other topic), I would send the board back to the supplier and ask for a new one or a refund.

Where did you buy the board?

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