Any Arduino geeks?

[GR63]

I have what might be simple to people above "numpty" skill level?

I have a programmed Arduino board and want to clone the existing sketch (which I dont have) to another board. Is that do-able assuming security bit not set and IF so, any chance of explaining (like I am five) how, please?

 

[GR63]

Thanks... I had read some stuff about avrdude but didnt find the commands I needed... I'll check again