we are sorry, it is not working.
Please test:
1.Toggle all the switches to Atmega1280 side;
2.connect to pc;
3.open the Arduino IDE;
4.select board–> Arduino Mega;
5.select the correct com port;
And download a blink sample sketch.
If not work, please try rebootloader it.
Here is the FUSE setting:
hfuse: 0xda
lfuse: 0xff
efuse: 0xfd
lock bit: 0x0f
Thanks
Albert