If it is from Geeetech, it sucks. Have you tried asking them how to do it?
I don't quite remember, but isn't the GT2560 board an inferior clone of the Mega2560 board? If so, we can probably figure out how to get things going.
How about you do this:
Figure out which open source board the GT2560 is a clone of. Get the schematics of both the GT2560 board and the original board. Supply those links here, and we should be able to figure out what it is going to take to get you up and running.
I don't quite remember, but isn't the GT2560 board an inferior clone of the Mega2560 board? If so, we can probably figure out how to get things going.
How about you do this:
Figure out which open source board the GT2560 is a clone of. Get the schematics of both the GT2560 board and the original board. Supply those links here, and we should be able to figure out what it is going to take to get you up and running.