Hello i just tried to give your core a test spin on a old atmega8 i had lying around but when i try to burn the boothloader i get this ""efuse" memory type not defined for part "ATmega8"
Fel vid bränning av bootloader." i have tried on 1.6.8 and 1.6.5, (core installed with the boards manager link)
I tried usbasp and stk500 board same message sorry.