I think I have a completely bricked Mega...
Loopback passes...
DFU programmed just in case...
Cannot use Arduino as ISP using an UNO
Cannot use Nick Gammon board identified or programmer, error is "Cannot enter programming mode"...
Trying to use avrdude manually using the fuses in this thread as well as the bootloader from the Arduino install, nothing...
Time to throw it out?
c:\Program Files (x86)\Arduino\hardware\tools\avr\bin>avrdude -p atmega2560 -c stk500 -P com12 -e -Ulock:w:0xEF:m -Uefuse:w:0xFD:m -Uhfuse:w:0xd8:m -Ulfuse:w:0xff:m -U flash:w:stk500boot_v2_mega2560.hex -C ../etc/avrdude.conf