If you install the Gen7 support correctly into arduino, from the link mr Traumflug provided, you will have Gen7 appear in the arduino menu for Board -> Gen7 with ATmega1284p... Just like in the picture on that page. And you select that, and the com port, and then click on the "Burn bootloader" which is in same menu. All from arduino gui. No need of an avrdude-gui anymore. The avrdude-gui i suggested before was only for the purpose of erasing the chip, and btw, if i am not mistaking, avrdudess gui does not provide erase, not sure though coz i dont use it.
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