the DuoX2 is probably just fine. Fragging like that, and the fact that your chip is getting power would indicate it is an issue with your soldering. the rebuild boards are junk and should not be used. Just use them to see where you should solder wires to, but do the rebuild with wires themselves.
99% of the time fragging is caused by bad soldering. My advice is to desolder and try again, and don't use the rebuild board. Post pics of your board if you are still having troubles.