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After long experimentation time I found out that the best solution is to apply a reduced supply voltage to the AVR.Use any of the following ways as described here http://vusb.wikidot.com/hardware .Personally I have used two diodes in series and usbasp worked like a charm!
Hope that's helpful!
chears

Hi everyone.I am opening this topic as a guide, in order to help any beginners,like me,experimenting with V-USB and facing the "Unknown USB Device" problem. First of all,I will introduce myself.I am Electronics and Computer Engineer studding at the Technical University of Crete,Greece. As ...