Arduino as ftdi

Ok. I wanted to try using my uno to reflash a cc3d quadcopter flight controller. I thought it would be easy, having used the method to reflash a minim osd, but had forgotten that a minim osd is an atmega328, and that mwosd was an arduino sketch.

I am pretty sure that the cc3d is nothing th at is related to arduino,,,, is it still possible, perhaps with a sketch, to run the arduino as a more standard ftdi??

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