USB2SERIAL Firmware

Hi, I've been using this USB2SERIAL board for some time now to program my Arduino Pro Mini 5V/16Mhz and Arduino Pro Mini 3.3V/8Mhz both equipped with an atmega328. After I did some experimenting with DFUprogramming (changing firmware using Atmel's Flip software), I can't get it to work again with the upper mentioned boards. Has anyone found the original hex file flashed to this board or have any other solution.

Thank you in advance !

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Arduino USB2SERIAL with an Atmega8U2. (see image)

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I have already tried that. doesn't work. thanks for the help though !