jerseyguy1996:
To do that, do I just change this line in board.txt:atmega328bb.bootloader.extended_fuses=0x05to
atmega328bb.bootloader.extended_fuses=0x06and then burn the bootloader again?
Yes that should do it. If you have a ISP programmer you shouldn't have to burn the whole bootloader. eg.
avrdude -c usbtiny -p m328p -U efuse:w:0x06:m